File this under 'Too weird of a job to turn down'.
A while ago I added one of my laser cut sliding disc tabs to Konrad's IRO. I set the spacing of the tab to work with a Broakland spin on ISO adapter on a standard track hub. (42mm chain line). Of course Konrad went and used a Profile hub with a 44mm chain line. This meant he had to run a shaved down ISO adapter in order for the caliper and rotor to line up.
He recently built up a new wheel set with Chub Hubs front and rear. (MTB disc front, and dual fixed rear). The plan was to use a White industries freewheel on the drive side, the spin on Broakland adapter and a Saint caliper on the non drive side. The only problem was that after the wheel built, it was found that there was NO WHERE for the caliper to sit.
It would smash on the spokes, or be too far out, or the rotor would hit the frame. Basically, any way you sliced it, something would smash into something else. So not only were the huge flanges and spokes in the way, the caliper adapter or caliper body was in the way.
I scratched my head about this one for a bit before deciding to very carefully measure EVERYTHING.
The more I measured, the weirder it got. Until something dawned on me. The Chub Hub has an even worse* chainline than the Profile hub.
Here's a post I found from when the Hive was set to re release the hub:
04-21-08, 12:26 PM
Hey Soil Sampler,
The chainline has not changed from the previous version - it is in fact 44.7mm. In the coming weeks, we will be adding all of this technical info to the website.
>is the chainline the same as the old hubs? 44.5?
Sometimes things get very complicated.
It looked tricky, but not impossible. So I started by relacing the wheel. All the spokes inbound, and 2x to get those crossings out of the flange and caliper's way. Now it looked like it was possible. If only I could get the caliper to float above the ISO mount on the frame, like a post mount...
Here's what I came up with:
Its sort of a reverse post mount that sits outside of the frame's sliding ISO tab. This allows near full range of caliper travel before bolt heads start interfering.
The distance from the backside of the caliper to the spokes is a good 0.021" and the distance from the caliper mounting nyloc nut to the rotor is around .028" (given a straight rotor). Plenty of room to work with, right?
The brake works silently, and wheel is solid so I'm stoked.
*Disclaimer: I am not actually dissing Chub hub for doing their own thing here. The width of the shell goes along with the 100mm+ flanges as part of it's design, it just didn't help in this non-standard application.0 comments... click to read and add yours >>