signo97 Posted April 26, 2022 Report Share Posted April 26, 2022 Hi, im using shimano xt 4 pistons brakes on my hex with a 180 rotor but with every adapter that i use the brake look really far from the disc. is this normal? thanks Quote Link to comment Share on other sites More sharing options...
signo97 Posted April 26, 2022 Author Report Share Posted April 26, 2022 Quote Link to comment Share on other sites More sharing options...
Daan Posted April 26, 2022 Report Share Posted April 26, 2022 Same here, disc mount on the Hex (our model at least) seems to be +23 mm, not +20. So using an IS->PM +20mm adapter and a 180 rotor will have a bit too much space above the disc. Ideally you'd run a 183 mm disc, or file 1.5 mm off the adapter. Tried the latter, but couldn't get it perfectly straight without access to a proper machine shop, so I just live with it. Just make sure to sand down the little ledge that will form at the top part of your pads once in awhile. Quote Link to comment Share on other sites More sharing options...
signo97 Posted April 26, 2022 Author Report Share Posted April 26, 2022 sand some mm from the adapter is dangerous? Quote Link to comment Share on other sites More sharing options...
Daan Posted April 26, 2022 Report Share Posted April 26, 2022 (edited) 42 minutes ago, signo97 said: sand some mm from the adapter is dangerous? No, but you have to get both faces where the caliper mounts onto perfectly straight and perpendicular to the mount, otherwise your caliper will sit at a slight angle, which is bad for performance. Edited April 26, 2022 by Daan Quote Link to comment Share on other sites More sharing options...
signo97 Posted April 26, 2022 Author Report Share Posted April 26, 2022 but with magura brakes i don’t have this problem, only with shimano it’s weird Quote Link to comment Share on other sites More sharing options...
Daan Posted April 27, 2022 Report Share Posted April 27, 2022 (edited) Check again, this issue is there with every brake. Tiny bit of pad doesn't touch the disc. Anyway, don't sweat it, it's normal on this bike. Edit: I asked Adam from Tarty a few years ago about this as well. To ease your mind, this is what he said: "Inspired have gone to the top of the tolerance on these specs to avoid issues with people going 'the other way' (trying to use a 203 rotor when it should be 200) and ensure full compatibility between brake systems (it will still work if an IS style caliper is a bit high but you're stuffed if it's too low!). Removing some material from the adaptors will work (happy to help with that if you like - we have a milling machine here), alternatively using smaller adaptors (for, say, 160 or 165) then a few washers between the adaptor and caliper will do the trick too, and allow you to fine-tune the rotor vs caliper position." Edited April 27, 2022 by Daan 1 Quote Link to comment Share on other sites More sharing options...
MaderaMark Posted April 27, 2022 Report Share Posted April 27, 2022 spacers and washers gave me nightmares before.... could also blames for broken calipers and adapters. Quote Link to comment Share on other sites More sharing options...
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