Disc Brakes on the Silvio 2.0
We'll probably issue an addendum to cover this, but I wanted to get some info out about what's involved and what I've found will and won't work so far.
Silvio 2.0 is principally a road bike. We had a lot of requests around installing discs on Vendetta and Silvio in their previous versions, frequently from randonneurs and folks concerned about braking with a fast bike on steep downhills and in poor weather. So John added disc tabs to the design. We didn't add lots of extra cable stops because the majority of riders will use road calipers, and then have unused cable stops flying in the wind and cluttering up a very clean design.
To install disc brakes, you need disc hubs, and Silvio 2.0 is designed for 130mm road hubs on the drive wheel. As has been pointed out, there aren't many of those out there.
I like disc brakes, and it was my intention from the beginning to install a set and see how well it worked. So I shoved a 29'r wheelset with 135mm drive hub spacing in there, and it works fine for me. The chainstay dropouts may not seem to align with the fork dropouts perfectly, but in practice everything works fine.
So the "Groupset" I built looks like this:
- Mavic A317 Disc-only rims on Shimano M525 hubs. A long quick release, like used on the Silvio 1.5, is needed.
- 160mm front disc, 140mm rear disc (Quest 2.0/3.0 spec) (A 160mm rear *might* fit, but it will be close to the seat stay)
- Avid BB5 Road calipers (Quest 2.0/3.0 spec)
- Ultegra 10-speed brifters, 3x10, Ultegra FD
- Ultegra Triple, 165mm cranks, modified granny ring to remove chain suck tabs.
- Deore M591 Rear Derailleur (I could have used the Ultegra derailleur, but wanted extra cage length for a wider cassette later)
Front cable stop is unnecessary. When the cable length is right and tensioned, the cable lays
exactly where it belongs and stays there without hitting my leg or rattling around.
Rear cable routing was with continuous housing (I find it makes cable maintenance easier), to run
Rear cable housing was routed from the frame exit across the rear seat stays, between the brake bridge and the elastomer spring support, and secured to one side with a discrete black wire tie.
You have to look for it to see it.
How does it work?
when I sqeeze 'em, they stop. BB7 calipers, or SRAM road hydraulics would work better.
But in riding this bike at the beach, and picking up sand, I realized I'd much rather replace brake discs than scored wheel rims.
And I like the way the bike looks a lot.
"I like disc brakes and I cannot lie..."