Ti Audax frame recommendations...

[pwa]

That confirms my impression. The frameset suits maxed out short reach brakes or 57mm reach brakes with the blocks mid slot.

[Brucey]

that is full stretch using those brakes! If these have 1-2mm more reach than earlier 'short reach' brakes then earlier short reach brakes (~49mm max) may not fit.

FWIW I'd be slightly worried that with those brakes at full stretch the left front brake block and/or the right rear might go into the tyre when the brake blocks get worn.

cheers

[Samuel D]

Front and rear posted for you. 2017 vintage frame. I bought a 6800 groupset for it.

Thanks, though it’s difficult to judge pad position on the rim from those photos (especially whether both ends of each pad, on both sides, regardless of how you’ve set the centring screw, are in a good position when the brake is applied). I would not want the pads to be maxed out at the bottom of the slot when they are new, because they may have to be moved down as they wear to avoid creeping dangerously close to the tyre. That or you’ll need to replace the pads early.

Doesn’t the BR-6800 have offset pivots for both arms? If so, both pads will creep upward with wear.

But clearly this set-up is only possible at all because Shimano increased the reach from 49 mm to 51 mm for the 6800 generation of Ultegra.

[Brucey]

...Doesn’t the BR-6800 have offset pivots for both arms? If so, both pads will creep upward with wear....

I think you are right, that is how the pivots are arranged. Those 6800 calipers look like a bit like a conventional side pull brake, but owe even more than a DP to brakes such as the Altenburger 'Synchron' (itself not a very good brake, just an interesting design). Both these brakes and the Synchron have brake blocks that move and arms that bear the braking load in the same way as a centre-pull brake, just with a different linkage driving it.



cheers

[David9694]

Another 2-3mm of drop would be ideal here, I agree.

Sounds like I’ll tricking down some part-worn pads to other bikes...

Edit: I notice the Spa Audax complete bike comes with Tektro 737s