Which brake mount d...
 

[Closed] Which brake mount do i need - Sram guide R 180mm rotor up to 200mm

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Morning all, I have a 2018 cnnondale se, its got the rockshox pike solo air 130mm travel boost fork and I'm after upsizing the front rotor from 180mm to 200mm. I just don't know which adaptor I need for the calliper to fit the fork, been looking at the planet x ones as they are cheap.
The brakes are sram guide R.

https://www.planetx.co.uk/i/q/BSSDBM/sram-disc-brake-mount-adaptor

Thats the link, but to the right Im not sure which option I would need. Thanks.


 
Posted : 12/03/2020 7:21 am
Posts: 41786
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Assuming it's a 180mm fork mount (i.e. there currently isn't any adapter at all) then you just need the 20mm post-post mount. You might need some ~1mm washers under it if it's a 203mm rotor, but you can try assembling it and if the rotor doesn't foul the bridge of the caliper then it's fine (likewise somethign has gone wrong if the pads aren't completely swept by the rotor.

You need those conical washers on top of the caliper when using this sort of adapter as the faces aren't parallel (the tops offset more than the bottom) so the bolts end up pulling the caliper at an angle.

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Posted : 12/03/2020 4:30 pm