Problem with brake / forks - help please!!!

miss notax

Hello wise BikeRadar types - I need your help :?

I am having a nightmare with the Santa Cruz build The bike has been in the shop for bloody ages (not their fault) as they were waiting for an adapter to fit some old Hope Mono Mini brakes (stolen from Notax's old Blur ) to my new Rockshox SID forks. However, now the adapter has arrived they have realised that it won;t all work with my 180mm front rotor

Apparently this is because whilst the (new) forks are post-mount, the brakes are ISIS (?) mount, which means they will only fit with a 205mm rotor. Something to do with the old Hope brakes already having some 'built in' spacing. They worked with Notax's old ISIS mount forks and a 180mm rotor, but not with my new ones

This is meant to be my xc race bike - I only have 180mm rotors on my downhill bike, so I think 205mm rotors are a massive overkill for me. I weigh under 9 stone so I just don't need this stopping power. But the other option is getting new brakes, which I can't really afford to do.

Any clever ideas on how I can around this? Or what would other peeps do? Or is this my fault for nagging Notax into giving me his nice retro Hope brakes? Either way I am gutted - I WANT MY NEW BIKE!!!!!!

Help please - I am a very miserable Miss Notax :roll:

miss notax

Oh, and I realise this is entirely my fault for buying parts that don't fit together. I just assumed that it there would be an adapter to sort out stuff like this :evil:

nicklouse

Clee cycles. KCNC Post to IS 160mm mount is what you need to run 180(5) on your forks.

miss notax

Thank you - i'll give them a call at lunchtime (can't pretend that conversation is work-related )

nicklouse

http://clee-cycles.co.uk/esite/P1043/product

just order it.

the 160mm one.

miss notax

nicklouse wrote:

http://clee-cycles.co.uk/esite/P1043/product

just order it.

the 160mm one.

You're sure it will fit? I'm not dounting you, i'm doubting my rubbish translation of what the bloke at the bike shop told me over the phone. I'm rubbish at relaying technical information

nicklouse

it is designed to allow a 160mm disc to fit on a 6" post mount. your fork is 6" post nount and the caliper is 180mm IS.
Sorted.

the only possible issue, can be resolved with a file, is any contact between caliper and adaptor.

miss notax

Right - ordered.

Thanks ever so much for your help, much appreciated!!

Dammit - bike shop called back before I ordered, so had a chat with them about this and they don't think it's going to fit Apparently the caliper size is +20 so by the time an adapter is fitted it's physically too far out to work with anything but a 205mm rotor.....

Will call Clee later and see what they say.

386ka

So, 160 + 20 out = 180 mm rotor fit?

160mm Disc Calliper Adapter to mount a 160mm IS calliper on a post mount fork with a 160mm disc.
It may not fit all callipers to all forks as there is very little clearance on some designs! If it does not fit - it can be returned
Will also fit a 180mm IS calliper to a post mount fork with a 180mm disc, or a 200mm IS calliper to a post mount fork with a 200mm disc. You do not have to go up a disc size

nicklouse

miss notax wrote:

Right - ordered.

Thanks ever so much for your help, much appreciated!!

Dammit - bike shop called back before I ordered, so had a chat with them about this and they don't think it's going to fit Apparently the caliper size is +20 so by the time an adapter is fitted it's physically too far out to work with anything but a 205mm rotor.....

Will call Clee later and see what they say.

yes so the 160 will work.

the caliper will be a No 3. which is 180(5) front 160(5) rear. as they have a standard Post to IS adaptor (which adds 20mm) is why they are having issues.

find out the caliper number so that all things can be clear.

YeehaaMcgee

miss notax wrote:

Apparently the caliper size is +20 so by the time an adapter is fitted it's physically too far out to work with anything but a 205mm rotor.....

Which is why Nick is telling you to get the 160mm adapter. 160mm+20 = 180.

Ah, damned tabbed browsing and work distractions, I see he got there before me.

miss notax

I asked the bike shop what the calliper size was and they said +20 - if I need any other info from them, what exactly do I need to ask them?

Sorry be a pain but I am desperately trying to get my head around all this. I can't believe that there isn't a way to fit all this together, and i'm a bit peeved that the bike shop can't sort it out. They have spoken to Hope who sent the adapter that doesn't fit (unless I have a 205 rotor), and which they reckon looks the same as the KCNC one :roll:

Yeeha - I get the maths but I have asked the bike shop if the 160 would work and they said no :? Not sure if they are being dim or I am, or if i'm missing something?

nicklouse

miss notax wrote:

I asked the bike shop what the calliper size was and they said +20 - if I need any other info from them, what exactly do I need to ask them?

Sorry be a pain but I am desperately trying to get my head around all this. I can't believe that there isn't a way to fit all this together, and i'm a bit peeved that the bike shop can't sort it out. They have spoken to Hope who sent the adapter that doesn't fit (unless I have a 205 rotor), and which they reckon looks the same as the KCNC one :roll:

Yeeha - I get the maths but I have asked the bike shop if the 160 would work and they said no :? Not sure if they are being dim or I am, or if i'm missing something?

the reason they say so is they dont know.

Hope IS caliper sizes.
5 - 160mm front 140mm rear
3 - 180mm front 160mm rear
8 - 203mm front 180mm rear


So i would say you have a pair of No3 calipers.

You have ordered the right part to allow you to use a 180mm disc with your fork.

YeehaaMcgee

There an sometimes be some minor compatibility issues with some adapters and callipers, but nothing that some swift filing work (to the adapter) can't sort out.
I've often been told categorically that a certain something just will not fit, but after a few seconds of bodging, it's perfect.

miss notax

Ok, i'm guessing that the bike shop won't necessarily start filing stuff down. I am thinking of collecting the bike as it is and doing the damn brakes / forks myself. At least then i'll actually have it in front of me. All the important stuff has been done - this is literally just bolting an adapter to the forks and the brakes, right? Or I need any more skills than that?

nicklouse

no skills needed. just a thumb. and no over tightening.

miss notax

Right, Notax is collecting the bike as it is and bringing it home. I totally understand everything that's been suggested here, but the shop still maintain that none of these adapters will fit. I have o idea who is right and wrong here!

I figure that if I have the bike at home I can try the adapters myself. If they don't fit, I can at least post photo's if and hopefully the collective brainpower of BikeRadar can come up with a plan B!

Many thanks for all of your help

YeehaaMcgee

miss notax wrote:

the collective brainpower of BikeRadar

ha! The collective brainpower here, is as useful as a parachute for a coal miner!

miss notax

I live in hope

cooldad

YeehaaMcgee wrote:

miss notax wrote:

the collective brainpower of BikeRadar

ha! The collective brainpower here, is as useful as a parachute for a coal miner!

I'll mine your coal in a minute.

nicklouse

and i will bash some heads together.

Plyphon

cooldad wrote:

YeehaaMcgee wrote:

miss notax wrote:

the collective brainpower of BikeRadar

ha! The collective brainpower here, is as useful as a parachute for a coal miner!

I'll mine your coal in a minute.

Brilliant.

miss notax

Very helpful boys, thank you :?

YeehaaMcgee

cooldad wrote:

YeehaaMcgee wrote:

miss notax wrote:

the collective brainpower of BikeRadar

ha! The collective brainpower here, is as useful as a parachute for a coal miner!

I'll mine your coal in a minute.

Do you promise?

YeehaaMcgee

miss notax wrote:

Very helpful boys, thank you :?

No need to thank us. Just filling time until you come back with the next set of minor inconveniences.

miss notax

miss notax

Hello again

Right, a little update on my Santa Cruz brake saga....

The KCNC adapter arrived yesterday and got around to fiddling with it all today. The upshot is that the adapter kind-of fits (as someone said previously, a bit of tweaking and it would), but it just doesn't seem quite right... The rotor is pushed across slightly leaving too little clearance between the forks and the rotor. In fact, I hadn't spotted this before but it's not got me wondering whether a 180 rotor is too much for the damn forks? I have a hunt and some reports say the SIDs work with 200mm rotors and some say just 160mm? One things for sure, is that the bike shop were daft to suggest a 200 mm rotor as the clearance would have been ridiculous :roll:

Anyway, I know I can replace half the caliper etc but I think i'm going to call it quits on this one and sell on the Hope Mini's and get some new (well, second hand) ones that will fit without all this hassle.

I am now completely baffled about what fits with what though :? I would like a 160 rotor front and back. I know I need a post mount front brake - but does this need to be a 160 'specific' front brake? Or can I get one that has been used with a 180 rotor and with some special-adjuster-magic get it to fit with a 160? I always assumed you could do these things but now i'm totally confused :oops:

And what about the rear brake? The caliper attachs directly to the frame, so does it need to be a '160' rear brake? And what fitting is that?!! IS mount? Is it possible for me to get the wrong fitting?!!

I actually had a dream about brakes last night (and mad Ebay people shouting at me about forks - but thats another story) which isn't right for a girl..... Help please!!!

(and if anyone fancies some nice retro Hope Mini brakes (no 3 size!) let me know )

nicklouse

Post mount calipers are in general a bolt directly to fork for 160mm discs.

Rear will be IS so if the new caliper is post mount you will need a IS to post 160mm rear adaptor.

miss notax

Thank you (again)

Do brakes usually come as a post mount front and an IS mount rear? And if so, am I understanding correctly that they'll both - in theory - fit without any of these 'trying to find adapters that work' challenges...?!

nicklouse

Nope. Now a days they come as post mount calipers with adaptors as needed. You should be able to spec when ordering from new.

Be aware Magura do there own thing on sizing so double check if you are temped by any.

miss notax

You're a lovely man