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PostPosted: Wed Nov 14, 2012 11:55 am 
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Joined: Tue Feb 28, 2012 6:47 am
Posts: 35
Location: Liverpool
I've done a few more small jobs which drop the weight a little more, I'll update shortly.
Those jobs got me thinking though...

I usually ride on road, singletrack and general X-country so I rarley heat up my 160mm rear rotor which makes me think that a 140mm rotor would be totally fine.

So is it possible? Would I need to downsize my caliper, shift the caliper rearwards by removing spacers, change pads?
I've uploaded a pic so you can take a close look, I've no idea so any help would be much appreciated.

[url][url=http://www.flickr.com/photos/79798036@N02/8184700949/]Image[/url]
DSC09774 by Chuck-light, on Flickr[/url]

[url][url=http://www.flickr.com/photos/79798036@N02/8184741126/]Image[/url]
DSC09776 by Chuck-light, on Flickr[/url]

(excuse the muck, only just got in)

Cheers guys

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Bike: 2012 Boardman HT Pro MTB - 21.838lbs / 9.906kg (for now...)


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Posted: Wed Nov 14, 2012 11:55 am 


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PostPosted: Wed Nov 14, 2012 12:39 pm 
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Joined: Wed Jan 18, 2012 4:23 pm
Posts: 417
Location: Midlands, United Kingdom
It's not happening, you have a post mount frame mount and it is set to make it suite a 160mm disc with no adaptor, so 160mm disc it is.

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Budget 26" HT build viewtopic.php?f=10&t=110956


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PostPosted: Wed Nov 14, 2012 5:01 pm 
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Joined: Thu Jan 13, 2011 4:04 pm
Posts: 510
Location: Sunny UK
^^^^ nope as he said - not unless you modify the frame.


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PostPosted: Sun Nov 18, 2012 10:07 pm 
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Joined: Wed Apr 08, 2009 5:23 am
Posts: 250
Location: Covington, WA
if you elect to trim down the post mounts, by 5mm, and do not use washers between the caliper and the post, you can drop the caliper by 10mm total, allowing for a 140 rotor.

The downside is not that there wouldn't be enough threading in the post (they are tapped quite deep enough), but once you trim the post, you'd need a 160-to-180 post spacer (10mm) just to go back to a 160 rotor w/ std. washers.
Not to mention losing a bit of caliper adjustability with no conical washers.

I have done this with noissues whatsoever, but never trimmed the post by a full 10mm just to save the caliper washers.


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PostPosted: Mon Nov 19, 2012 6:55 am 
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Joined: Wed Jan 18, 2012 4:23 pm
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Location: Midlands, United Kingdom
Those posts won't trim by 10mm, yes you could trim by 5mm and lose the washers, but then you'd be stuck with Avid callipers forever....

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PostPosted: Mon Nov 19, 2012 8:14 am 
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Location: Western Australia
Just don't do it. I'm all for tuning, but this isn't happening.

The weight saved, for once, will not be worth the list of negatives as a result.

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Posted: Mon Nov 19, 2012 8:14 am 


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PostPosted: Mon Nov 19, 2012 12:48 pm 
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Joined: Wed Jan 18, 2012 4:23 pm
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Location: Midlands, United Kingdom
Too right, the thought of never being able to junk the Avid brakes is terrible! :D

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