I'm having a custom frame made for me (steel) with very modern geometry. ST diameter is 28.6mm - and I want to use a band-on/clamp style front derailleur rather than braze-on (as I may go 1 x 11 or 1 x 12 in future...)
I cannot see that SRAM make a 28.6mm clamp at all, they only seem to do 31.8mm or 34.9mm. However, there are several 28.6mm clamps available, such as the Shimano Dura Ace Di2 AD91 clamp here: http://www.chainreactioncycles.com/shim ... prod150256
Can anyone see any reason why this adapter, or any other non-SRAM adapter wouldn't work?
Again, I might just be being paranoid... but all these reports of fussy shifting with eTap front derailleurs and how picky they are on braze-on tab alignment has got me (a little) worried.
There are two benefits to the SRAM one.
- the long flat interface between clamp and derailleur. makes for more repeatable adjustment (it always tightens to the same place) and supports the derailleur body against the power of the motors.
- the chain spotter stop which allows use of the quite nice SRAM chain spotter that is very stable and more accurately and repeatedly adjustable.
If you use a different braze on clamp.
- for the body support you can just use the wedges supplied with the derailleur
- you can use any other non SRAM chain spotter
If you wanted to use SRAM there are many 28.6 to 31.8 shims to go under the 31.8 clamp.
Parlee do a braze-on adapter but it's $95 (OMFG. !!!!). https://store.parleecycles.com/products ... leur-clamp
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Quite disappointed that you're not searching for the lightest adapter and instead defaulting to the heavier variety. Unless you're planning on reducing the mass of the SRAM variety?!
There are adapters competitive to Parlee's that are as light as the Parlee one at a fraction of the cost. Use your internet skills to find it, it isn't difficult.
http://www.carbonice.net/Front-Deraille ... anguage=en
"Sometimes you don't need a plan. You just need big balls." Tom Boonen
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