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I discovered why I got the Merak for nearly nothing.normal brake lock, is stripped.
When it came time to install the rear brake I found a bolt somehow installed in the rear B-stay brake hole that has a 5 mm threaded hole in it. It is aluminum so the forward end of the device (between the B-stay and seat tube) which appears to be a
Since the B-stay is carbon fiber I don't think that it is screwed in. I would think that it is a slight interference fit which would explain the stripped allen end. I suppose I could thread in the 5 mm allen bolt and using a puller, push the fittingout. Hopefully that would leave the original brake hole in original condition.
I have never seen a rear brake attachment of this sort so I am asking if anyone has ever seen anything like this and if they have any comments on it and if they could suggest a removal technique that would leave the hole in original condition?
On 1/1/2025 2:46 PM, cyclintom wrote:normal brake lock, is stripped.
I discovered why I got the Merak for nearly nothing.
When it came time to install the rear brake I found a bolt somehow installed in the rear B-stay brake hole that has a 5 mm threaded hole in it. It is aluminum so the forward end of the device (between the B-stay and seat tube) which appears to be a
out. Hopefully that would leave the original brake hole in original condition.Since the B-stay is carbon fiber I don't think that it is screwed in. I would think that it is a slight interference fit which would explain the stripped allen end. I suppose I could thread in the 5 mm allen bolt and using a puller, push the fitting
I have never seen a rear brake attachment of this sort so I am asking if anyone has ever seen anything like this and if they have any comments on it and if they could suggest a removal technique that would leave the hole in original condition?
There is something inside your rear brake mount?
And that is a bolt? Or a sleeve with a 5mm threaded bore?
What is a B stay?
What is a normal brake lock?
Could it be a stuck/corroded brake mounting nut? That would
be M6 not M5. An aluminum nut may well be corroded in
place. Clean as well as possible, examine in a good light
with a magnifier if needed to see what it is an dhow it's
held in place.
On 1/1/2025 6:20 PM, cyclintom wrote:2BSogBVxH8U3lJYJ9cCu1IHbjcweuReuInwNEbjWdSN0YS743SYts0ZqnTbaXTlvuKSY6sywZQureWu4x4wfDXgFkt0cutCbAuWgNrXUrAyZ0kHi9fGa9FDktoHBJ2Ou5RhYYeJpFZojnp7qCmg2u61ElYwc8ZHbrzANgaQ2bBquUYm9q0wd1ExtoN%2Bp%7Ctkp%3ABk9SR-bN5sGEZQ
On Wed Jan 1 16:14:05 2025 AMuzi wrote:
On 1/1/2025 2:46 PM, cyclintom wrote:
I discovered why I got the Merak for nearly nothing.
When it came time to install the rear brake I found a bolt somehow
installed in the rear B-stay brake hole that has a 5 mm threaded
hole in it. It is aluminum so the forward end of the device (between
the B-stay and seat tube) which appears to be a normal brake lock,
is stripped.
Since the B-stay is carbon fiber I don't think that it is screwed
in. I would think that it is a slight interference fit which would
explain the stripped allen end. I suppose I could thread in the 5 mm
allen bolt and using a puller, push the fitting out. Hopefully that
would leave the original brake hole in original condition.
I have never seen a rear brake attachment of this sort so I am
asking if anyone has ever seen anything like this and if they have
any comments on it and if they could suggest a removal technique
that would leave the hole in original condition?
There is something inside your rear brake mount?
And that is a bolt? Or a sleeve with a 5mm threaded bore?
What is a B stay?
What is a normal brake lock?
Could it be a stuck/corroded brake mounting nut? That would
be M6 not M5. An aluminum nut may well be corroded in
place. Clean as well as possible, examine in a good light
with a magnifier if needed to see what it is an dhow it's
held in place.
1. https://www.ebay.com/itm/387414175414?_skw=B-
stay&itmmeta=01JGJ1SMVC3X64P451Y7V26RDP&hash=item5a33af2eb6:g:ojsAAOSwapJm8SeY&itmprp=enc%3AAQAJAAAA4HoV3kP08IDx%2BKZ9MfhVJKkKk%2BT%2BCfPB1NFw1gIOhTDcX5INzW7ZyWXx6ymLMxxUkrjgqEbMjg7byxSVBbnUf1OSX%2Fvcil1p15XMnhKWGWTb3w6SI%
2B8jjBW5Zwe9gx3ufmUqMQbR28s5kmllEA6TneV3nRuIyCrBZ3w2AHL8T%2Fum15FGCrgWW3lJa5poIsouZTt3cjjMZUTQ6ChkB5U0JDjSSF6K8J4s9R1YtMY9twloP2CvPnXPEA01h2at9kiWlAko%2BecP%2FnrsuiewDvsK2lC1HohuyheFliyzVpmmF1v9KImGbXMTdMZt7gyFMor%2B%2BtTLFBurUsXqzG0OeVxPKt3VXc9zg%3D%
2. https://www.ebay.com/itm/183751311056?_skw=Ultegra+rim+
+brake+fixing+nut&itmmeta=01JGJ1RGGSH2W5TD4WMQXC1WN8&hash=item2ac86e7ed0:g:SLAAAOSw5cNYbIi8&itmprp=enc%3AAQAJAAABAHoV3kP08IDx%2BKZ9MfhVJKmDXGrXXDIzZaBH8%2FV8tvPcg9OmXd%2BLSGTrZ0E3ttBzz91TsnLw5frOpgp5%2BaLgKnsVuajVdLQlissnahvLQ1s%
3 No chance at all. The threads start at juust below the surface of
the brake hole.
The answers to Andrew's questions are still not clear to me, except that
a "B stay" seems to be a proprietary term for an odd frame configuration.
I don't recall seeing any brake mounting hardware that took an M5
fastener. I think M6 is normal.
The photos of the bike are helpful, but can you post and link to a
closeup photo of the object(s) you're asking about? That, and/or a good engineering drawing of the relevant part might allow some of us to help.
It's a marketing name for the piece, but not necessarily anything odd.
The "B-stay" is a Colnago proprietary seat-stay assembly of a rear
"wishbone design", except that it's a modular formed CF piece designed
to insert into a seat lug receiver and studs on the rear dropouts. IOW,
it's only a "B-stay" when it's made by Colnago. It's not a "b-stay" on a DErosa Merak unless Derosa sourced the piece from Colnago. I believe
Columbus made a similar piece under the "Curve" moniker.
I don't recall seeing any brake mounting hardware that took an M5
fastener. I think M6 is normal.
M6 is normal, the issue is that tommy is still under the impression that
the screw size is defined by the drive tool, not the screw dimension (remember his insistence that the water bottle screws on his Basso were
M4s).
I really can't say what a "normal brake lock" is. I suspect it's just
the bolt, similar to how he called the cable clamp on the derailleur a
"lock" recently.
On Thu Jan 2 09:46:17 2025 Zen Cycle wrote:
It's a marketing name for the piece, but not necessarily anything odd.
The "B-stay" is a Colnago proprietary seat-stay assembly of a rear
"wishbone design", except that it's a modular formed CF piece designed
to insert into a seat lug receiver and studs on the rear dropouts. IOW,
it's only a "B-stay" when it's made by Colnago. It's not a "b-stay" on a
DErosa Merak unless Derosa sourced the piece from Colnago. I believe
Columbus made a similar piece under the "Curve" moniker.
I don't recall seeing any brake mounting hardware that took an M5
fastener. I think M6 is normal.
M6 is normal, the issue is that tommy is still under the impression that
the screw size is defined by the drive tool, not the screw dimension
(remember his insistence that the water bottle screws on his Basso were
M4s).
I really can't say what a "normal brake lock" is. I suspect it's just
the bolt, similar to how he called the cable clamp on the derailleur a
"lock" recently.
Proprietary? This is not an uncommon assembly. Though perhaps Colnago has rights to the name. I doubt that though since Trek made on before Colnago.
De Rosa Macro Aluminum Carbon Frame - Size: ST 50 TT 53 - Light Blue | eBay
Canyon road bike frame Air Road CF Team Omega Pharma-Lotto Model Carbon L Rare! | eBay
Giant TCR Advanced SL Medium Frameset (Trek Cervelo Specialized Colnago Merckx) | eBay
Trek 120 OCLV Carbon Road Bike Frameset 58mm Large Made in USA Blue 2004 | eBay
On Thu Jan 2 09:46:17 2025 Zen Cycle wrote:
It's a marketing name for the piece, but not necessarily anything odd.
The "B-stay" is a Colnago proprietary seat-stay assembly of a rear
"wishbone design", except that it's a modular formed CF piece designed
to insert into a seat lug receiver and studs on the rear dropouts. IOW,
it's only a "B-stay" when it's made by Colnago. It's not a "b-stay" on a
DErosa Merak unless Derosa sourced the piece from Colnago. I believe
Columbus made a similar piece under the "Curve" moniker.
I don't recall seeing any brake mounting hardware that took an M5
fastener. I think M6 is normal.
M6 is normal, the issue is that tommy is still under the impression that
the screw size is defined by the drive tool, not the screw dimension
(remember his insistence that the water bottle screws on his Basso were
M4s).
I really can't say what a "normal brake lock" is. I suspect it's just
the bolt, similar to how he called the cable clamp on the derailleur a
"lock" recently.
Proprietary? This is not an uncommon assembly. Though perhaps Colnago has rights to the name. I doubt that though since Trek made on before Colnago.
De Rosa Macro Aluminum Carbon Frame - Size: ST 50 TT 53 - Light Blue | eBay
Canyon road bike frame Air Road CF Team Omega Pharma-Lotto Model Carbon L Rare! | eBay
Giant TCR Advanced SL Medium Frameset (Trek Cervelo Specialized Colnago Merckx) | eBay
Trek 120 OCLV Carbon Road Bike Frameset 58mm Large Made in USA Blue 2004 | eBay
On Thu, 02 Jan 2025 16:08:19 GMT, cyclintom <cyclintom@yahoo.com>
wrote:
On Thu Jan 2 09:46:17 2025 Zen Cycle wrote:
It's a marketing name for the piece, but not necessarily anything odd.
The "B-stay" is a Colnago proprietary seat-stay assembly of a rear
"wishbone design", except that it's a modular formed CF piece designed
to insert into a seat lug receiver and studs on the rear dropouts. IOW,
it's only a "B-stay" when it's made by Colnago. It's not a "b-stay" on a >>> DErosa Merak unless Derosa sourced the piece from Colnago. I believe
Columbus made a similar piece under the "Curve" moniker.
I don't recall seeing any brake mounting hardware that took an M5
fastener. I think M6 is normal.
M6 is normal, the issue is that tommy is still under the impression that >>> the screw size is defined by the drive tool, not the screw dimension
(remember his insistence that the water bottle screws on his Basso were
M4s).
I really can't say what a "normal brake lock" is. I suspect it's just
the bolt, similar to how he called the cable clamp on the derailleur a
"lock" recently.
Proprietary? This is not an uncommon assembly. Though perhaps Colnago has rights to the name. I doubt that though since Trek made on before Colnago.
De Rosa Macro Aluminum Carbon Frame - Size: ST 50 TT 53 - Light Blue | eBay
https://www.ebay.com/itm/146020934203
Canyon road bike frame Air Road CF Team Omega Pharma-Lotto Model Carbon L Rare! | eBay
<https://www.ebay.com/itm/204948864806>
Giant TCR Advanced SL Medium Frameset (Trek Cervelo Specialized Colnago Merckx) | eBay
No match found.
Trek 120 OCLV Carbon Road Bike Frameset 58mm Large Made in USA Blue 2004 | eBay
<https://www.ebay.com/itm/396082900316>
I'll wait for Tom to post a photo of his DeRosa Merak.
On 1/2/2025 8:20 PM, Jeff Liebermann wrote:
On Thu, 02 Jan 2025 16:08:19 GMT, cyclintom
<cyclintom@yahoo.com>
wrote:
On Thu Jan 2 09:46:17 2025 Zen Cycle wrote:
It's a marketing name for the piece, but not necessarily
anything odd.
The "B-stay" is a Colnago proprietary seat-stay assembly
of a rear
"wishbone design", except that it's a modular formed CF
piece designed
to insert into a seat lug receiver and studs on the rear
dropouts. IOW,
it's only a "B-stay" when it's made by Colnago. It's not
a "b-stay" on a
DErosa Merak unless Derosa sourced the piece from
Colnago. I believe
Columbus made a similar piece under the "Curve" moniker.
I don't recall seeing any brake mounting hardware that
took an M5
fastener. I think M6 is normal.
M6 is normal, the issue is that tommy is still under the
impression that
the screw size is defined by the drive tool, not the
screw dimension
(remember his insistence that the water bottle screws on
his Basso were
M4s).
I really can't say what a "normal brake lock" is. I
suspect it's just
the bolt, similar to how he called the cable clamp on
the derailleur a
"lock" recently.
Proprietary? This is not an uncommon assembly. Though
perhaps Colnago has rights to the name. I doubt that
though since Trek made on before Colnago.
De Rosa Macro Aluminum Carbon Frame - Size: ST 50 TT 53 -
Light Blue | eBay
https://www.ebay.com/itm/146020934203
Canyon road bike frame Air Road CF Team Omega Pharma-
Lotto Model Carbon L Rare! | eBay
<https://www.ebay.com/itm/204948864806>
Giant TCR Advanced SL Medium Frameset (Trek Cervelo
Specialized Colnago Merckx) | eBay
No match found.
Trek 120 OCLV Carbon Road Bike Frameset 58mm Large Made
in USA Blue 2004 | eBay
<https://www.ebay.com/itm/396082900316>
I'll wait for Tom to post a photo of his DeRosa Merak.
Of the 3 frames tom posted which have valid links, only the
De Rosa has the configuration we're discussing. The Canyon
and TreK are both full carbon lugless designs. The Giant TCR
series never used a hybrid carbon/Al construction. As for
the DeRosa, the seat stay assembly is likely a generic
component sourced from a Taiwanese vendor. As I mentioned,
"B-Stay" is a Colnago trademarked marketing term for their
design. Tommy is attempting to genericize the term.
On Thu Jan 2 10:36:19 2025 AMuzi wrote:
On 1/2/2025 10:08 AM, cyclintom wrote:
On Thu Jan 2 09:46:17 2025 Zen Cycle wrote:
It's a marketing name for the piece, but not necessarily anything odd. >>>> The "B-stay" is a Colnago proprietary seat-stay assembly of a rear
"wishbone design", except that it's a modular formed CF piece designed >>>> to insert into a seat lug receiver and studs on the rear dropouts. IOW, >>>> it's only a "B-stay" when it's made by Colnago. It's not a "b-stay" on a >>>> DErosa Merak unless Derosa sourced the piece from Colnago. I believe
Columbus made a similar piece under the "Curve" moniker.
I don't recall seeing any brake mounting hardware that took an M5
fastener. I think M6 is normal.
M6 is normal, the issue is that tommy is still under the impression that >>>> the screw size is defined by the drive tool, not the screw dimension
(remember his insistence that the water bottle screws on his Basso were >>>> M4s).
I really can't say what a "normal brake lock" is. I suspect it's just
the bolt, similar to how he called the cable clamp on the derailleur a >>>> "lock" recently.
Proprietary? This is not an uncommon assembly. Though perhaps Colnago has rights to the name. I doubt that though since Trek made on before Colnago.
De Rosa Macro Aluminum Carbon Frame - Size: ST 50 TT 53 - Light Blue | eBay >>>
Canyon road bike frame Air Road CF Team Omega Pharma-Lotto Model Carbon L Rare! | eBay
Giant TCR Advanced SL Medium Frameset (Trek Cervelo Specialized Colnago Merckx) | eBay
Trek 120 OCLV Carbon Road Bike Frameset 58mm Large Made in USA Blue 2004 | eBay
I did not know the term. We normally use "seatstay" or
"seatstays".
For purposes of mounting a caliper, the monostay top portion
makes no difference. Zip. Nada. None.
I wonder if it's "B-stay" to honor Keith Bontrager, who
developed and popularized that style in 1985?
Back to your question, try slipping a 5mm bolt into those
threads. If it falls through, you have an M6; likely just a
brake allen mounting nut possibly stuck in the brake
mounting hole.
Yes, it is an M6 fitting.
Of the 3 frames tom posted which have valid links, only the De Rosa has
the configuration we're discussing.
The Canyon and TreK are both full
carbon lugless designs. The Giant TCR series never used a hybrid
carbon/Al construction. As for the DeRosa, the seat stay assembly is
likely a generic component sourced from a Taiwanese vendor. As I
mentioned, "B-Stay" is a Colnago trademarked marketing term for their
design. Tommy is attempting to genericize the term.
On Fri, 3 Jan 2025 08:27:09 -0500, Zen Cycle <funkmaster@hotmail.com>
wrote:
Of the 3 frames tom posted which have valid links, only the De Rosa has
the configuration we're discussing.
Thanks. I'm still having difficulties visualizing a B-Stay. I tried searching for a photo of a rear brake mount (both caliper and disk)
but couldn't find anything that matches Tom's description. I'm not
sure that anyone uses caliper brakes on a carbon fiber frame without
also using an aluminum insert to reinforce the carbon fiber. When I
search for it, all that appears are photos of carbon fiber caliper
brakes: <https://www.google.com/search?num=10&q=caliper+bicycle+brakes+on+carbon+fiber+frame&udm=2>
Granted, there are carbon fiber caliper brakes, but those don't seem
like the brakes that Tom is using. For example: <https://bikerumor.com/ciamillo-is-back-with-insanely-lightweight-carbon-fiber-lekki8-road-brake-calipers/>
I guess I'll just wait for Tom to post a photo of his DeRosa Merak.
The Canyon and TreK are both full
carbon lugless designs. The Giant TCR series never used a hybrid
carbon/Al construction. As for the DeRosa, the seat stay assembly is
likely a generic component sourced from a Taiwanese vendor. As I
mentioned, "B-Stay" is a Colnago trademarked marketing term for their
design. Tommy is attempting to genericize the term.
I'm not sure Colnago has a trademark (or wordmark) on B-Stay. I
searched the USPTO site which found 6552 that were active, none of
which are registered to Colnago.
<http://tmsearch.uspto.gov>
General Search = B-Stay
Refine Search = Colnago
To demonstrate that the search works, try "Trek" in the Refine Search
box.
On 1/3/2025 8:00 PM, Jeff Liebermann wrote:
On Fri, 3 Jan 2025 08:27:09 -0500, Zen Cycle <funkmaster@hotmail.com>
wrote:
Of the 3 frames tom posted which have valid links, only the De Rosa has
the configuration we're discussing.
Thanks. I'm still having difficulties visualizing a B-Stay. I tried
searching for a photo of a rear brake mount (both caliper and disk)
but couldn't find anything that matches Tom's description. I'm not
sure that anyone uses caliper brakes on a carbon fiber frame without
also using an aluminum insert to reinforce the carbon fiber. When I
search for it, all that appears are photos of carbon fiber caliper
brakes:
<https://www.google.com/search?num=10&q=caliper+bicycle+brakes+on+carbon+fiber+frame&udm=2>
Granted, there are carbon fiber caliper brakes, but those don't seem
like the brakes that Tom is using. For example:
<https://bikerumor.com/ciamillo-is-back-with-insanely-lightweight-carbon-fiber-lekki8-road-brake-calipers/>
I guess I'll just wait for Tom to post a photo of his DeRosa Merak.
The Canyon and TreK are both full
carbon lugless designs. The Giant TCR series never used a hybrid
carbon/Al construction. As for the DeRosa, the seat stay assembly is
likely a generic component sourced from a Taiwanese vendor. As I
mentioned, "B-Stay" is a Colnago trademarked marketing term for their
design. Tommy is attempting to genericize the term.
I'm not sure Colnago has a trademark (or wordmark) on B-Stay. I
searched the USPTO site which found 6552 that were active, none of
which are registered to Colnago.
<http://tmsearch.uspto.gov>
General Search = B-Stay
Refine Search = Colnago
To demonstrate that the search works, try "Trek" in the Refine Search
box.
"B-stay" is Colnago's name for a monostay, popularized by
Keith Bontrager starting 1985 (his were steel).
https://www.flickr.com/photos/cyclart/5640932051/
A monostay is a seatstay assembly which is only one tube
above the brake mount: >https://www.jimbobsbikebuildz.com/uploads/1/4/6/5/146525512/img-2669.jpg
(I linked that photo yesterday)
The carbon assembly as shown, or with extended upper carbon
portion, is a commodity produced by several vendors;
Reynolds, Deda, Columbus besides everyone and his brother in
china.
There is seldom (or none? I don't know of any) a metal liner
as the depth of the carbon brake mount is adequate without them.
I don't know from trademark but Colnago uses, or did 15
years ago anyway, the "B Stay" name on their monostays:
https://www.roadbikereview.com/attachments/img_1298-jpeg.497324/
The obsessive Colnago types on roadbikereview.com indicate
that Colnago began using these in 2001:
https://www.roadbikereview.com/threads/colnago-c40-b-stay-serial-number.387136/
