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 Post subject: Rear disc brake question
PostPosted: Fri Jan 05, 2007 8:17 pm 
East Midlands AEC
East Midlands AEC
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Joined: Thu Oct 05, 2006 7:45 pm
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Location: Derby, UK
Sorry about the stupid question but never having had a rear disc brake before - if I have a wheel with a 155mm rotor on it, will that fit most rear disc calipers on standard IS mounts - how does it work?

As I'm sure all rotors aren't the same size at the back and I have seen conversion kits for the larger rotors, but what is the standard rear rotor size?


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 Post subject:
PostPosted: Fri Jan 05, 2007 9:52 pm 
retrobike rider
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Its not that straight forward. Which rotor and disc brake we talking about? Its cheaper to buy a new rotor £12-30, than a caliper


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 Post subject:
PostPosted: Fri Jan 05, 2007 10:09 pm 
Old School Grand Master

Joined: Wed Jun 29, 2005 11:18 am
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Location: near cwmcarn
different size rotors need different size calipers. hope have a sizing guide for rotor against the older (numbered) calipers on the minis. what brakes exactly?


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 Post subject:
PostPosted: Sat Jan 06, 2007 12:46 am 
East Midlands AEC
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Well, it's from the wheelset I just bought (see this thread: http://www.retrobike.co.uk/forum/viewtopic.php?t=6056&highlight=dumb), and this was the description on Ebay: http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ih=001&sspagename=STRK%3AMEWN%3AIT&viewitem=&item=110069768322&rd=1&rd=1

He says it's a 155mm, I haven't measured yet. I haven't bought the brake yet as I wasn't sure what I'll need. Am I better getting a bigger rotor to make it easier to find a brake for it, or am I likely to get what I want to fit a 155mm rotor?


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PostPosted: Sat Jan 06, 2007 2:39 am 
Retro Guru
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Location: Hobart, Tasmania, Australia
orange71 wrote:
if I have a wheel with a 155mm rotor on it, will that fit most rear disc calipers on standard IS mounts


Standard rotor size is 160mm, so it will probably fit ok depending on what caliper you use.


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 Post subject:
PostPosted: Sat Jan 06, 2007 9:54 am 
Old School Grand Master

Joined: Wed Jun 29, 2005 11:18 am
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Location: near cwmcarn
yeh you can use a 155mm rotor on a caliper meant for 160mm. just keep an eye on the pads, as the upper 2.5mm unaffected upper disc pad area wont wear & will leave you with a pad ridge. take a dremel to it time to time & it'll be fine.


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 Post subject:
PostPosted: Sat Jan 06, 2007 10:48 pm 
Gold Trader / MacRetro rider
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Joined: Sun Apr 02, 2006 1:03 pm
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bolt it up and have a look
but 160/180/ 203 are common sizes today
that's not to say.......
mike


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