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PostPosted: Sat Jan 19, 2013 1:19 pm 
Geoff Capes
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Joined: Sun Feb 12, 2012 10:33 pm
Posts: 956
Location: On my laptop somewhere..
I use the flat side of a ruler to get a visual but it would be good to have some figures..


Anthony wrote:
Bear in mind that it was c1.7mm thick when it was new, so if it's now c1mm concave it means you've only got 0.7mm left.



Are rims standard spec in this respect or do they vary from brand/model?

Cheers


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 Post subject:
PostPosted: Sat Jan 19, 2013 1:44 pm 
Old School Grand Master
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Joined: Fri May 01, 2009 7:11 pm
Posts: 8479
Location: Fircombe.
saulus wrote:
I use the flat side of a ruler to get a visual but it would be good to have some figures..


Anthony wrote:
Bear in mind that it was c1.7mm thick when it was new, so if it's now c1mm concave it means you've only got 0.7mm left.



Are rims standard spec in this respect or do they vary from brand/model?

Cheers
Some are concave from the start. Check out this profile;
http://www.araya-kk.co.jp/rim/archive/1992/01-02.htm


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 Post subject:
PostPosted: Fri Jan 25, 2013 2:35 am 
Retro Guru

Joined: Wed Nov 28, 2012 11:39 pm
Posts: 287
Location: NYC
After breaking down my old (generally tired) front wheel today I decided to cut the rim open to have a look just how close I'd come to blowing out the rim.

It's a Mavic X618 CD, hand-built about 8 years ago, doing about 50 miles a week with a V-brake & Avid RW2 pads.

Image

Image

I'm pretty impressed. These rims have been the very definition of tough, and it appears they have a lot of material in them. They were the default rim for a lot of couriers at my workplace back in the early 2000s and I can see why. Even with no spokes in, and a 4" section chopped out, the old X618 rim still feels very strong.
My rear wheel has more braking surface left than this one had, and the Hope hub is still very smooth so I've decided I'm not going to break it down just yet.


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 Post subject:
PostPosted: Fri Jan 25, 2013 7:19 am 
Classified Mod
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Joined: Wed Dec 30, 2009 8:34 pm
Posts: 12690
Location: Fife in Scotland
Mavic 230SBP (will I continue to use Mavic, Yes!)
Image
Image


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 Post subject:
PostPosted: Fri Jan 25, 2013 11:25 am 
Retro Guru
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Joined: Thu May 08, 2008 4:18 pm
Posts: 2336
618s were great -- they're essentially 517s with thicker sidewalls and double eyelets.


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PostPosted: Fri Jan 25, 2013 6:55 pm 
retrobike rider
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Joined: Thu Apr 17, 2008 1:24 am
Posts: 7561
Location: Manchester
RobMac wrote:
Mavic 230SBP (will I continue to use Mavic, Yes!)
Image
Image


230's are terrible. I recently checked mine and three were cracked. Two of them didn't even have much wear.


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PostPosted: Tue Jul 01, 2014 11:16 pm 
Retro Guru
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Joined: Fri Sep 09, 2011 11:30 am
Posts: 358
Location: Hell of the North
I love my SBPs.


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 Post subject: Re:
PostPosted: Tue Jul 01, 2014 11:58 pm 
Retro Guru

Joined: Sat Jun 26, 2010 11:07 pm
Posts: 1897
Location: brighton
xerxes wrote:



How does one of these work? Probably a stupid question but where does it measure from and to?


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PostPosted: Wed Jul 02, 2014 12:27 am 
retrobike rider
retrobike rider

Joined: Thu Apr 17, 2008 1:24 am
Posts: 7561
Location: Manchester
It measures from each side of the rim.


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 Post subject: Re:
PostPosted: Wed Jul 02, 2014 8:03 am 
Retro Guru

Joined: Sat Jun 26, 2010 11:07 pm
Posts: 1897
Location: brighton
So measuring the difference between the most worn part and the unworn part? So each side of a rim must be perfectly parallel when new? Will the gauge fit over a tyre or does the tyre have to be removed (probably depends on tyre thickness I guess)?


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