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PostPosted: Fri Apr 27, 2012 8:43 am 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider

Joined: Thu May 06, 2010 10:05 pm
Posts: 5644
Location: Aberdeen
I've had disc brakes in the past but they've either come already set up on a bike or have been a complete set I've bought with all the correct bits & pieces included.

Now however I have a Pace RC38 fork, an Avid Juicy 5 disc brake caliper & lever for the front, a 160mm Avid disc rotor, and a (presumably post-mount adapter) 185mm spacer/mount thing for it.

I've tried the caliper on for size and it seems to fit the Pace RC38 forks, do I need such an adapter for these forks? what sort is it I should be using? a Post-Mount or IS one? as using the adapter which came with the brake and says "Avid 185mm" on it seems to put the caliper in the right position-ish :?

However, when using this adapter the 160mm disc rotor will not fit the caliper correctly :roll: so whats the easiest way around this? do I get a different caliper adapter to space the caliper to suit a 160mm disc and then also get a 160mm disc? or do I simply buy a 185mm disc and use the current hardware?

I thought 160mm disc up front would be more than enough for a retro XC bike, does a 185mm disc really give that much more bite?
And why are there so few 185mm disc rotor sabout? 180mm seems to be the more common size?

:? :) :? :( :o


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PostPosted: Fri Apr 27, 2012 12:13 pm 
Old School Grand Master
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Joined: Mon Jun 14, 2010 9:06 pm
Posts: 4426
Location: Herts UK
to save weight :? I replaced the front 185 mm discs by 160 and they stop me fine. (pretty sure 185 is the more common diameter)

on my lightest hardtail, I have 160/140 KCNC razor discs that stop me too but not quite so well but enough (check them discs out, more air than metal).

I am 95 kg +/- a couple.


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PostPosted: Fri Apr 27, 2012 1:45 pm 
Old School Grand Master
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Joined: Mon Jun 25, 2007 8:37 am
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Location: Whiskey bent & hellbound!
I'd be inclined to run the 185 up front, the added weight isn't really too much of an issue as the diameter does make quite a difference is stopping power & cooling.


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PostPosted: Fri Apr 27, 2012 5:29 pm 
Retro Guru
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Joined: Thu Oct 06, 2011 10:23 am
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Location: Black Country
Pace recommend 165mm dia disc maximum, run a 160mm on my RC39's

http://www.pacecycles.com/PDFs/SpecSheet.pdf


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PostPosted: Fri Apr 27, 2012 9:19 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider

Joined: Thu May 06, 2010 10:05 pm
Posts: 5644
Location: Aberdeen
not_fat_matt wrote:
Pace recommend 165mm dia disc maximum, run a 160mm on my RC39's

http://www.pacecycles.com/PDFs/SpecSheet.pdf


forkin' 'ell I thought I remember seeing that somewhere :roll:

as I have a 160mm disc then I guess I need to find an adapter to mount the Juicy5 caliper to the fork to suit a 160mm disc.

Anyone help me out? is it a IS to Post-Mount adapter I need? like this one?...
http://www.ebay.co.uk/itm/Avid-Disc-Brake-Adaptor-Mount-Front-160mm-International-Standard-/170831341698?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item27c6576882


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