Anyone know anything about disc brakes?

New bike, shifters come with the connection at the shifter end and they'll eventually be paired with Hope RX4 calipers which I think come with everything I need at the caliper end.

Should be fine with the cheaper one of you've got all the fittings.

Sounds like you're sorted and can the cheaper one then.

Cool good to hear, thanks

Yep looks like it was me. Overnight no more fluid seems to have bubbled through. Will keep a watch on it tho

disc basics: If my caliper won't go any further in (towards the axle), does this picture indicate that I should be using a smaller rotor?

frame and caliper holes do not meet up

1 Attachment

160mm rotor?

Probably need one of these: https://www.sjscycles.co.uk/brakes/sram-rear-20f-flat-mount-bracket-rear-160-mm/

I have a shimano 160mm flat mount adapter I could sell you cheap if you need

yeah there's a 160 in there now. is a 140mm rotor a more elegant solution than the adapter?

140 rotors aren't as good unless you only care about weight.

cheers. being clueless about this, where is the incompatibility? is the frame designed for 140?

The flat mount part of the frame is designed for 140, but is is fully compatible with 160 if you use one of the adaptors such as this. Basically it creates a platform for the caliper to go on which sits it up higher over the rotor.

many thanks. @atz i will pm you

Yeah, most flat mount frames are capable of using 140 so you've got the option or just use a little adapter if you want a proper sized rotor. Fronts are usually designed around a flippable front 140/160 adapter.

yeah i have one of those flippable jobs on the front.

the options re. discs are still baffling to me, but cabling and adjusting the front one was a piece of piss once i had all the parts.

Can you not move the caliper holes back by loosening that black screw in the chainstay? Looks like it would fit without an adaptor then.

Miles away ain't it? Caliper isn't attached to the dropouts.

Doesn't look like it to me. Is that not why they are moveable? Like loosen the orange bolt,slide them back and then the caliper looks like it should fit. The caliper has to move up a bit too which would make it able to move right a bit too.

I tried looking to see if its an intended feature but cant seem to find the exact bike/frame.

ignore this, its wrong

I cant seem to upload that picture here directly for some reason

No, they're one piece

Ah ok that would make sense then, ignore me!

The caliper mount holes and the wheel axle are connected at a fixed distance for easy adjustment. That is the whole point of these sliding dropouts.

Rear flat mount caliper mounts are (usually) always for 140mm rotors. with the extra option of a 160mm adapter (as @snottyotter hints at)

edit: or see @Phildas reply :)

yeah, this conversation has resolved itself but FYI the frame is a trek crockett with 'stranglehold' dropouts

my front DA R9100 caliper has been a bit iffy past few months. thought it was just a sticky piston and have tried to remedy but gonna swap out the caliper as lost quite a bit of power/bite (swapped pads but not helped)

link to a good resource for a straight swap? do i need new olives/barbs or is it fine to just unscrew, install new caliper and then full bleed?

was gonna go with RX4s but didnt want to go 160 on the back/replace my discs

being clueless about this

get hydro

RX4s you'd need hope fittings to go with but they are included, whatever shimano you go for will work, you'll probably get away with just unscrewing it and screwing the new one in but wouldn't hurt to have the correct olive and barb for your hose to hand just in case.