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these tires on these wheels?

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these tires on these wheels?

Old 03-17-11, 12:04 PM
  #1  
rawhite1969
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these tires on these wheels?

I ride a 10 y/o Trek 7300 - a "hybrid". Alexrims DA16 wheel on the front. Same size different brand on the rear. I'm running a 700x29 tire now and have had 700x38 on it. If I have clearance will I have any issues running something wider? Like a 700x47 or 700x54? I'm going to be commuting to work and would like the extra "beef" to deal with the less than ideal roads.

Would love some input. Thanks!
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Old 03-17-11, 01:29 PM
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The rear triangle has less clearance than the shock. I think you could run a 47 street tire but probably smaller if you want a knobby tire, but you would just have to try to mount one up and see as tires this size have a lot of variations in both the height and width of tire much bigger than the 32c.
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Old 03-17-11, 02:32 PM
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They will fit perfectly on the rims, but you may not have enough room in the fork or down between the chainstays. You can get tires up to 2.5 " wide that will fit on your rims, but it is ulikely the wheels will fit back on your bike after the tires are mounted.

If you are buying the tires from a LBS, see if you can return them if they are mounted and do not fit after inflation.

Are you a heavier-than-average rider? I weigh between 260 and 270 lbs and I have had no problems when running 700 X 38s nice and soft (~45 - 50 psi) for my commute on a gravel road. The worst thing that can happen is a pinch flat if you are too heavy for the pressure you choose to run in the tires you choose to mount, or if you like to slam really hard into curbs and the edges of potholes.

Last edited by SmallieBiggs; 03-17-11 at 02:35 PM.
 
Old 03-17-11, 02:36 PM
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I think the schwalbe site has a chart for sizing help

http://www.schwalbetires.com/tech_info/tire_dimensions
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Old 03-17-11, 03:38 PM
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The tires will fit, but be less than Ideal. A mounted tire should have an Omega shaped profile. When you use tires disproportionate to the rim's width the tire loses some lateral rigidity. It can also cause wheel removal issues with caliper brakes who'se QRs only have a finite amount of throw.

BTW- there are a number of guides to the target range for tire and rim matching, and they're in general agreement, which is pretty rare in the bike world.
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Old 03-17-11, 04:23 PM
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Thanks everyone. Looks like I'm maxed out on the 700x38 on the back due to my fenders. without them I could go wider.

I think I'll put the 38s back on the bike and lower the tire pressure a bit - I'm in the 60-70 range. That should get me a bit more "beef" and smooth out the ride a bit. Can always put the skinnier ones back on for the Charity Rides.


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Old 03-17-11, 07:12 PM
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Your roads must look like a war zone if you need tires that big to avoid flats or to soak up the bumping. I'd think that 32's to 38's with a bit less than full pressure would provide a decently comfy ride. If it's flats you're worried about then look at tires with flat resistant kevlar belts.
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Old 03-17-11, 07:25 PM
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Actually you may already be pushing your luck a little. I double checked the specs posted on the Alex Rim website for their 26in DA 16 rims and its listed as ETRTO 559-16mm. The external rim width is 22.4mm and the internal rim width is only 16.3mm. Pretty narrow.

You can check out that compatability chart on the Schwalbe website and consider what FB has already posted about tire shape - the omega shape is pretty ideal. A wider rim will give less height and a lower profile tire that will let you run less pressure and still have reasonable handling.

You`re going the other way. Puting a larger tire on a narrower rim forces the tire to assume a more vertical profile - except that the innertube really wants to be round. So everything has a practical limit. A really narrow rim and really wide tire tends to be really squirmy unless the pressure is raised - and then eventually you reach a point on a really wide tire/narrow rim where the inner tube simply wants to push the tire off the rim.

I`d stick with what you`ve got or change rims.
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Old 03-18-11, 07:05 AM
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Originally Posted by Burton View Post
Actually you may already be pushing your luck a little. I double checked the specs posted on the Alex Rim website for their 26in DA 16 rims and its listed as ETRTO 559-16mm. The external rim width is 22.4mm and the internal rim width is only 16.3mm. Pretty narrow.
The OP is using 700c rims, not 26". Trek hybrids came with 700c rims and 700x38 tires as OEM fitment.

I agree that the stock 38 mm tires should be plenty wide for road use, even bad roads. I have a Surly Cross Check with 700x32 tires I run at 80-85 psi and they tolerate nearly anything. An even wider 700x38 should be nearly bullet proof at reasonable pressure.
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