Hey Andrew, I was hoping to pick your brain on parts for my
tandem. I let the chains go too long, and now need new drive
components. I've run a triple chainring as follows:
Small: 26T-74 (BCD)
Mid: FSA 39/30T S-10 130 mm BCD
Big: FSA 50/39T N10 130 mm BCD
Couldn't find the exact FSA parts, so ordered this:
130BCD 50T-39T Double Chainring, CNC Machined 2X Road & Folding
Bike Crankset Disc, Fit 9/10/11 Speed Bike Crank Chainwheel/295
https://www.amazon.com/dp/B0GTL62R6C?ref=ppx_yo2ov_dt_b_fed_asin_title
After placing the order it occurred to me that these don't seem to
be ramped and pinned, and a Google inquiry suggests that the CNC
machining is supposed to take its place. Do you think these will
work for me?
ALso, I ended up getting this for the small inner ring:
TRIPLE ROAD CHAINRING INSIDE SPECIALITIES T.A. 5BRA ZELITO 7075
SHIMANO 9-10V
https://velo-store.shop/customer/order/389005758
That seems like a good replacement, though pricey. Any concerns?
On 9/15/2026 3:08 PM, Ted Heise wrote:
Hey Andrew, I was hoping to pick your brain on parts for my
tandem. I let the chains go too long, and now need new drive
components. I've run a triple chainring as follows:
Small: 26T-74 (BCD)
Mid: FSA 39/30T S-10 130 mm BCD
Big: FSA 50/39T N10 130 mm BCD
Couldn't find the exact FSA parts, so ordered this:
130BCD 50T-39T Double Chainring, CNC Machined 2X Road & Folding
Bike Crankset Disc, Fit 9/10/11 Speed Bike Crank Chainwheel/295
https://www.amazon.com/dp/B0GTL62R6C?ref=ppx_yo2ov_dt_b_fed_asin_title
After placing the order it occurred to me that these don't seem to
be ramped and pinned, and a Google inquiry suggests that the CNC
machining is supposed to take its place. Do you think these will
work for me?
ALso, I ended up getting this for the small inner ring:
TRIPLE ROAD CHAINRING INSIDE SPECIALITIES T.A. 5BRA ZELITO 7075
SHIMANO 9-10V
https://velo-store.shop/customer/order/389005758
That seems like a good replacement, though pricey. Any concerns?
Your link shows 130mm rings which are both ramped and
pinned. This is now standard for modern shifting systems
and an excellent improvement over plain rings, given our
current flush chain rivets.
Premium rings are coined but CNC is a less expensive
production technique. Both work, with possibly slightly
longer life on a coined surface.
TA are top quality rings they do not make any second level
product.
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