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Why do these Rims and Tires work together?

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Why do these Rims and Tires work together?

Old 02-22-24, 12:35 PM
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Why do these Rims and Tires work together?

I bought a bike used and it has Mavic Open 4 CD 650 V rims paired with Vittoria Competition Mastercross 700x27c PRB tires. I'm confused why they work together? Isn't the tire bigger then the rim? I want to buy some new tires but am not sure what to get. Can anyone out there explain to this novice whats going on?
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Old 02-22-24, 12:38 PM
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https://www.sheldonbrown.com/harris/tires/index.html
Read the sizing part-
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Old 02-22-24, 12:50 PM
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Thanks for the help!
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Old 02-22-24, 12:59 PM
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Does the rim label have any sizing information on it? Upload a pic of the rim label and the tire size to the Gallery here on BF and we can find it if you tell us it's there.

Those rims and tires are from the olden days. But a page on Velobase says MAVIC made the rims in several different sizes. 24" (520mm BSD), 700C (622mm BSD) and 650C (571 BSD)

It'd be virtually impossible to put a 700C tire on a 650C rim. So possibly the rim was mislabeled. Nothing that hasn't happened before.

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Old 02-22-24, 01:04 PM
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Oh, you did upload to the Gallery...



Other pics from the OP are here....

https://www.bikeforums.net/g/album/32778495

I wouldn't assume that 650V on the label for the anodizing is a wheel size. I've don't recall ever seeing "V" used for tire or wheel sizing. Might have been just the name of their particular anodizing process.


Last edited by Iride01; 02-22-24 at 01:07 PM.
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Old 02-22-24, 03:15 PM
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I don't think the 650V has any relation to tire sizing. It looks like a pretty standard 700c wheel. A, B and C are French sizing designations used generally for 650 and 700 with 650B and 700c being still relevant and the occasional 650c popping up here and there from old tri bikes and smaller wheeled stuff like Terrys.

Looks neat. If you wish to get more current tires in green Michelin has them though they are going to be of a proper cyclocross width for these days 33 generally as that is the widest you can run in UCI competition which is positively narrow for todays bikes but I guess it adds to the fun and excitement.
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Old 02-22-24, 03:22 PM
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Side question
What's going on with the un-even wear on the braking surface on those rims? wear marks dip lower at spoke nipples? are the spokes flaring the rim?
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Old 02-22-24, 03:45 PM
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Originally Posted by SoCaled
Side question
What's going on with the un-even wear on the braking surface on those rims? wear marks dip lower at spoke nipples? are the spokes flaring the rim?
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Old 02-22-24, 04:02 PM
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Originally Posted by SoCaled
Side question
What's going on with the un-even wear on the braking surface on those rims? wear marks dip lower at spoke nipples? are the spokes flaring the rim?
The last. Riveting the ferrule in the spoke hole distorts the rim a tiny amount. This causes a smidgen of extra brake wear near the spoke hole. Obviously those rims have not seen a lot of use in the last 20 or 30 years.
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Old 02-22-24, 08:50 PM
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Doing some measurements its a standard 700cc wheel, thanks for all the help here!
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Old 02-22-24, 08:52 PM
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Originally Posted by Jeff Wills
The last. Riveting the ferrule in the spoke hole distorts the rim a tiny amount. This causes a smidgen of extra brake wear near the spoke hole. Obviously those rims have not seen a lot of use in the last 20 or 30 years.
It sat in a garage for who knows how long until I got it a month ago. Is this any cause for concern/anything I could do to address it?
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Old 02-22-24, 09:15 PM
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Probably a good idea to inspect the tires for sidewall defects/rot/whatever.
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Old 02-23-24, 05:39 AM
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I think 650V may be 650 Vickers hardness. Hard anodizing (grey aluminum oxide, same as sharpening stones) is pretty darned hard, harder than high quality knives, until you get really premium steel with a lot of vanadium carbides.
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Old 02-23-24, 05:44 AM
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Originally Posted by Jeff Wills
The last. Riveting the ferrule in the spoke hole distorts the rim a tiny amount. This causes a smidgen of extra brake wear near the spoke hole. Obviously those rims have not seen a lot of use in the last 20 or 30 years.
You may be right, but I think the eyelet is well away from the sidewall area so that is not it. If you picture the spoke tension pulling the rim radially inward, on a local basis at the rim, it's a beam in bending, so the inside at the eyelet is in circumferential tension, and toward the outside it's in circumferential compression, however it's an open section there, so the sidewall is more free to move, and it's going to buckle outward slightly there. Just my guess. They say I can see in FEA (now called FEM).

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Old 02-23-24, 09:08 AM
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Originally Posted by SoCaled
Side question
What's going on with the un-even wear on the braking surface on those rims? wear marks dip lower at spoke nipples? are the spokes flaring the rim?
Spoke tension slightly deforms the rim sidewalls, creating high spots that wear more quickly than the sidewall between spokes.
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Old 02-23-24, 10:14 AM
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Originally Posted by JohnDThompson
Spoke tension slightly deforms the rim sidewalls, creating high spots that wear more quickly than the sidewall between spokes.
Yup. The perfect explanation. Back in the day it was extremely common to see that pattern on the brake track of colored rims. It was there on silver rims too but you didn't see it because there was no contrast.
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