Brake adaptor advic...
 

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Brake adaptor advice please, folks

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I’ve been assembling parts for a single speed build and now I’m very nearly there

Next on the list is brakes…

I have this frame which is currently boxed up but can get better pictures if needed

https://ibb.co/ygRXrzZ

I’m looking at a set of these brakes

https://www.chainreactioncycles.com/mobile/shimano-slx-m7100-disc-brake/rp-prod188515

Rotor size yet to be decided but probably 180

What adaptors am I likely to need to make all this work together?

Thanks in advance, all


 
Posted : 05/04/2023 11:55 am
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Look like both front and rear are IS brake mounts so you'll need a front 180 IS and rear 180 IS of these: https://www.ebay.co.uk/itm/252002929400?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=p5EP7AAZRf2&sssrc=2349624&ssuid=6YfCa0A_QQi&var=550866356224&widget_ver=artemis&media=COPY

Uberbike look like they do something similar for £9.99 an end too.


 
Posted : 05/04/2023 12:05 pm
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IS mount on the frame and fork in the pic.

IS to 180 PM ADAPTER. Just bear in mind the front and rear are specific for IS. (IIRC)


 
Posted : 05/04/2023 12:06 pm
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I’d read somewhere that is was IS, always good to have these things double checked by people who actually know what they’re talking about

Will have a look at the links shared


 
Posted : 05/04/2023 12:27 pm
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Would 160 on the back not be fine? Don’t know how easy finding an IS calliper would be though.


 
Posted : 05/04/2023 3:24 pm
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Don’t know how easy finding an IS calliper would be though.

Why would you need to? Just use an adaptor.

Rear is always 20mm less than the front (so a front 200mm adaptor is rear 180mm)


 
Posted : 05/04/2023 3:33 pm
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Why would you need to?

Because life isn't taxing enough.


 
Posted : 05/04/2023 3:40 pm
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Don’t know how easy finding an IS calliper would be though.

IS calipers are/were crap as you had to shim them

It's moot because not one (aside from maybe Hope) makes them anymore.

That being said I prefer the IS interface (with a post adaptor) as putting threads that are used for caliper adjustment on Magnesium Forks and Alu/Carbon frames is awful idea, unless a threaded insert is used, which is what Nicolai do I think.


 
Posted : 05/04/2023 3:53 pm
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as putting threads that are used for caliper adjustment on Magnesium Forks and Alu/Carbon frames is awful idea,

I always thought that but I've never seen a damaged one (and I've seen / worked on a *lot* of bikes)


 
Posted : 05/04/2023 4:01 pm
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IS calipers are/were crap as you had to shim them

It’s moot because not one (aside from maybe Hope) makes them anymore.

Hope stopped that with the M4 Evo.

I suppose one advantage of IS mounts is you can shim them for non-boost hubs and just align on the adaptor as normal. Shims were only a PITA as every hub seemed to have a different offset (unless you dropped one in long grass) but if they didn't they would have been better as they would align every time you took them off. I suppose you could achieve the same thing with a pair of feeler gauges on PM though.


 
Posted : 05/04/2023 4:38 pm
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Rear is always 20mm less than the front (so a front 200mm adaptor is rear 180mm)

Thanks for that @squirrelking, always good to know


 
Posted : 06/04/2023 8:41 pm
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IS tabs with post mount adapters is the best of both worlds, god knows how you face post mounts if they're out of whack, Hope had a cheapish facing tool for IS, it also made removing and reinstalling Hope calipers a breeze, no need to faff about re-centering the calipers every time.


 
Posted : 06/04/2023 9:49 pm
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I recently bought one of the new Commencal frames and weirdly it has an IS mount brake. So one of the old IS mount adapters in my spares, for many years, came in very useful. I've also got an XTR IS mount brake on another bike, which is nice. It's not crap at all.


 
Posted : 06/04/2023 10:12 pm
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IS tabs with post mount adapters is the best of both worlds,

This. I used Hayes HFXs back in the day. Used to laugh at the IS users struggling with shims to get things aligned.


 
Posted : 06/04/2023 10:55 pm

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