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28mm on Alex r450 rims?

Old 09-05-19, 11:05 AM
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Jackj59
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28mm on Alex r450 rims?

Correction: Rims are Alex AT450
I think there would be clearance on my bike - 2010 Trek 2.1 - for 28mm (and would like to) but the Alex site says the rims only take up to 26mm.
Any thoughts on this issue? Thanks!

Last edited by Jackj59; 09-05-19 at 02:33 PM. Reason: Correction
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Old 09-05-19, 11:14 AM
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It's a skinny rim, but people have run wider tires on narrower rims than that, no issue. Used to be common for tourers to run 32mm tires on Mavic MA-2s, for example.
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Old 09-05-19, 12:07 PM
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Thanks! Now the next issue I'm discovering: from another good thread, I was going to try Conti Ultra Sport II's, but see that many have issues getting them on. Am I right that it would be even worse trying to get 28's on my narrow rims? Because I struggled even getting Gatorskin 25's on, and I didn't see anyone complaining about them being problematic. Unfortunately, one of my Gatorskins separated from the bead within 100 miles - and others have had a similar issue lately - so I thought I'd try a different tire, thinking there may be a recent production issue with the Gatorskins.
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Old 09-05-19, 12:44 PM
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Struggled, as in struggled to get the bead to seat, or struggled to get them over the rim?

I found the 28mm UltraSports went on to my (WH-500) wheels easier than the 23mm Kendas they replaced

The Gatorskins have a very tough carcass, so they don't have much 'stretch' to get them on or off the rim.

As far as rim width, that's a subjective topic around here. BF is pretty road-biased, so it's commonly reccomended not to go more than +1 on the tire size.
I come from XC mountain bikes where running 44-48mm tires on 17mm rims was pretty normal, but according to BF, i'm going to die.


I think if your TREK can fit a 28mm without rubbing the frame, you should be OK.
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Old 09-05-19, 02:07 PM
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Thanks much. I struggled to get them over the rim. I read horror stories of popping tubes getting the Ultra II's to seat. Thanks much for the feedback!
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Old 09-05-19, 02:22 PM
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Originally Posted by ThermionicScott View Post
It's a skinny rim, but people have run wider tires on narrower rims than that, no issue. Used to be common for tourers to run 32mm tires on Mavic MA-2s, for example.
Agreed. I've run 33mm CX tires on a rim that skinny before. It's not optimal, but the tires stayed on and I didn't die.
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Old 09-05-19, 02:55 PM
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Originally Posted by Jackj59 View Post
Thanks! Now the next issue I'm discovering: from another good thread, I was going to try Conti Ultra Sport II's, but see that many have issues getting them on. Am I right that it would be even worse trying to get 28's on my narrow rims? Because I struggled even getting Gatorskin 25's on, and I didn't see anyone complaining about them being problematic. Unfortunately, one of my Gatorskins separated from the bead within 100 miles - and others have had a similar issue lately - so I thought I'd try a different tire, thinking there may be a recent production issue with the Gatorskins.
The circumference of the tire bead should be the same for all 700C tires, regardless of width. Now, obviously it varies a little by brand, tire model, production run, etc, but if a particular 23mm tire mounted without much fuss, I'd expect the 28mm version of that tire to mount just about as easily.

When mounting a tire, it's a good idea to move the bead into the very center of the rim so that it's at the lowest point in the "well" and gives you the most slack to get the rest of the tire on. (In the diagram below, you can see how the rim bed has a dip to it.) Ideally, you shouldn't have to use levers. Once you've got the last of the bead on, it's good to work your way around the tire on both sides, pushing the sidewall away from the rim to check if the tube is pinched in between. I like to put a tiny bit of air in the tube before installing it, this helps avoid trapping the tube in between the tire and the rim at any point.

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Old 09-07-19, 02:20 PM
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Thanks!
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