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So I emailed Stanton about singlespeed dropouts for my gen3 sherpa and good news is that they should be available in March. Bad news is that I can't for the life of me work out how disc brakes would work.
The dropouts are a very elegant bolt through horizontal set up with integral tug nuts. But the disc mount (IS) is on the frame....... How is that going to work? Is there some splendid slotted IS to PM adaptor that I'm unaware of that rotates or slides and moves the caliper to match the drop outs?
Indeed there is…
IS to PM mounts adaptor thingies, think paid a tenner for a pair on eBay, will try and find the link…
@donslow isn't your frame slotted rather than the adaptor though?
It is yes, apologies, I saw you asking about IS mounts and started running with it in “I got some of those” kind of way
So not just me that has no idea how this would work then......
If they’re making singlespeed dropouts are they also machining a sliding brake adaptor as part of the kit?
I asked that as a follow up, but it then went very quiet....
W 7
I had a Last frame with a similar setup - sliding dropouts but nothing to move the brake caliper. When I asked Last they did a virtual shoulder shrug - I think for the amount of adjustment needed to tension a chain that it's one of these issues that only exists in theory, in practice the slight change of alignment across the top of the disc will make very little difference, at least that's how it worked on my frame. Sometimes simpler is better.
Fair enough. From the pic I reckon that there is >10 mm adjustment on offer through the dropouts, which seems a lot. But I guess if the mid adjustment is centred on the caliper, and the caliper is at disc TDC, then that is only 5mm each way. Maybe it would work.
You can get away with a small amount of adjustment but just need to watch for the caliper rubbing the disc or unworn parts of pads bottoming against each other.
A slotted IS to pm adapter could be made if you are handy with a drill, saw and file. An arced slot design gives approx double the adjustment (eg 10mm slots allow 20mm of wheel movement).
Photos are of a slotted dropout not adapter but gives an idea how the arcs work (the horseshoe thing is my dropout jig that shows the IS alignment).
Thanks, an adaptor version of that was what I was imagining.
Dan responded with a nice rendering of a sliding is to pm adaptor. So all looks good!