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Old 08-02-12, 07:14 PM   #1
otis66
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Tire size for 26" wheel.

I have two Bontrager 26" Mountain bike wheels. The rims are 7/8" wide alumimium. What would be the thinest tire I could safely use for the wheel. I'm converting my MTB into a commuter. I would also like 80psi for the tires.
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Old 08-02-12, 07:18 PM   #2
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While you might be able to get away with using 1" tires, I think 1.25-1.5" would be perfect for commuting.
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Old 08-02-12, 07:46 PM   #3
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Who makes a 26" 1.25" tire that holds 80psi?
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Old 08-02-12, 08:03 PM   #4
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Who makes a 26" 1.25" tire that holds 80psi?
Quick google shows kenda qwiks are rated to 85 PSI

http://www.cyclesport.com/road-bike/...E-2634-X-12534
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Old 08-02-12, 08:05 PM   #5
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Who makes a 26" 1.25" tire that holds 80psi?
Several manufacturers, and Performance has a couple on sale:
http://www.performancebike.com/bikes...y=&searchTerm=

FWIW: I put 26 x 1.25" Tioga City Slickers on my mountain bike a few years ago. They were rated at 100psi. This made the bike a fun and fast commuter.
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Old 08-02-12, 08:13 PM   #6
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Running these 26x1.25" Forte tires on one of my bikes.
http://www.performancebike.com/bikes...99_-1___400237
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Old 08-02-12, 09:10 PM   #7
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These are what I use on my grocery getter- 100 PSI & relatively inexpensive.

http://www.biketiresdirect.com/produ...et-runner-tire
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Old 08-03-12, 06:57 AM   #8
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+1 to all of the above. I used Nashbar's "City" 26x1.25" tires on an early 90's Trek MTB that came with 2.125" OEM tires and the Nashbar's fit and worked fine. You will have to recalibrate your cyclometer if you use one.
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Old 08-03-12, 07:29 PM   #9
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I went to two LBS today and I ended up getting Specialized Nimbus Sport 26X1.5 tirs. 80psi. Theses were the only 26X1.5 80psi tires I could find. So far the tires are riding pretty good.
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Old 08-03-12, 07:53 PM   #10
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Why the fixation with 80 PSI?
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Old 08-04-12, 06:47 AM   #11
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80psi gives me a nice smooth ride. I'm also a Clyde...345LBs.
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Old 08-04-12, 10:00 AM   #12
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80psi gives me a nice smooth ride. I'm also a Clyde...345LBs.
In your original post, you were looking for the thinnest tire that took 80 PSI.
That was a bit confusing, because it inferred you wanted the thinnest tire that would fit your rims and didn't want one that took more/less pressure.

Since you only wanted to go to a 1.5" tire, you should have asked if that would fit and if it was available in a tire that took at least 80 PSI.
Knowing your weight, I wouldn't have recommended a 1.25" tire.
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Old 08-04-12, 10:48 AM   #13
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When I went to my LBS the salesman wanted to sell me 1.25 tires because they did not have 1.5's. I have a Park Tool Big Blue Book Of Bicycle repair that says the tire should be no thinner than 1.5 times the rim width. That would be aprx a 1.372 tire for my rims. I thought the Bike shop was trying to sell me tires that were too thin. The book says that a tire that is too thin for the rim will flatten the profile of the tire. Since I joined this site I can see that a 1.25 tire is a common thing to do. In fact most of the LBS carry 1.25 and not 1.5. It took me a while to find a LBS that had 1.5 80psi in stock. I think the 1.25 would be a better faster tire but because of my weight I got the 1.5. Tire sizes and rim size is new to me. I'm a rookie when it comes to working on modern bicycles.
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Old 08-04-12, 12:46 PM   #14
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They tend to be on the conservative side when recommending min/max due to lawyers etc.

The 26X1.25 are pretty much designed for MB width rims simply due to thee fact narrower 559MM rims just aren't as common.

I run 26MM tires on my hybrid with 20MM wide rims and nothing looks weird or gives me cause for concern. I would even go to 25MM, although not less than that.

With your weight, 1.5" sounds good to me. A smaller tire would have to be pumped up to a near rock hard state.
A bit of cushion will result in less strain on everything when you hit a pot hole.

As a side note-
I'd suggest getting your spokes PROPERLY tensioned. At least the rear wheel, since that is the most problematic.
You are trying to "unwind" 1/2 the spokes when you pedal, so each stroke gives a tightening/loosening effect on the rear spokes.
Under tensioned spokes kind of get a "running start". This tends to flex the spokes at the bend and results in cumulative metal fatigue.
Properly tensioned insures the spokes "share the load" evenly and minimize the "running start" effect.
I'd also avoid standing on the pedal and mashing down hard.
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