28 clincher wheels help


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ohmybike

Finally riding a big boys bike
Jan 29, 2018
374
245
Fort Myers, FL
#1
Ok. I bought a set of 28” wheels. Didn’t realize that there 2 different sizes. I noticed when I was trying to put tires. The rear wheel measures 25” round and the front measures 25 3/4” round. For sure is not s set. Where would the front be from? Thanks.
 

Duchess

Wore out three sets of tires already!
Feb 14, 2014
514
902
Beverly, MA
#2
I imagine you mean diameter, in which case the smaller size would be ISO 635mm or what was also called 700b. The other one I have no idea as I can't find anything that's ISO 654mm (25.75"). What are you measuring to? ISO is the most precise measuring standard and it refers to the bead seat diameter in mm rather than a mix of archaic systems that often use almost the same terminology, but are not interchangeable. Does the larger size wheel have some kind of wall extension beyond the bead seat? The next larger size is 642mm, which was also called 700a. Anything I can find that's larger is much too large.
 

ohmybike

Finally riding a big boys bike
Jan 29, 2018
374
245
Fort Myers, FL
#3
I imagine you mean diameter, in which case the smaller size would be ISO 635mm or what was also called 700b. The other one I have no idea as I can't find anything that's ISO 654mm (25.75"). What are you measuring to? ISO is the most precise measuring standard and it refers to the bead seat diameter in mm rather than a mix of archaic systems that often use almost the same terminology, but are not interchangeable. Does the larger size wheel have some kind of wall extension beyond the bead seat? The next larger size is 642mm, which was also called 700a. Anything I can find that's larger is much too large.
I’m measuring from top to bottom. That sucks now I have locate same style rim. Could it for a tall frame bike?

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Lux Low

Finally riding a big boys bike
Feb 7, 2010
173
94
Lux Low Ranch Golden Colorado
luxlow.com
#4
Unfortunately there are no new tires available for the rims above, those rims take a unique clincher tire that wrapped around a tube and folded together fitting in the slot. I have used 27 inch but the pop the bead, riding probably will not be in your favor on those. You can Use Sheldon Brown's site to get good cross reference on wheels sizes and bsd.
 

ohmybike

Finally riding a big boys bike
Jan 29, 2018
374
245
Fort Myers, FL
#5
Unfortunately there are no new tires available for the rims above, those rims take a unique clincher tire that wrapped around a tube and folded together fitting in the slot. I have used 27 inch but the pop the bead, riding probably will not be in your favor on those. You can Use Sheldon Brown's site to get good cross reference on wheels sizes and bsd.
Nope not going to use the front one for sure. I got some tires for the rims. The rear is ok they fit fine but not the front. Now I’m on the look out for a front clincher rim. Smh ‍♂️
 

bikeguy53

'Lil Knee Scuffer
Apr 18, 2012
10
3
San Jose, CA
#6
Just curious, what size tire did you get to fit that? Just a FYI, the bead seat diameter is a bit smaller than the edge to edge measurement.

According to my Sutherlands manual there is a 28x1 1/4 / EA2 / 700 that is a bead seat diameter of 647. I have never seen one in 40 years of bicycle work, but there may be one out there somewhere. It's hard enough to get 28x1 1/2.

Check out this chart, pretty nifty:

https://www.bikecollectives.org/wiki/index.php?title=Rim
 
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