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.

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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.

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