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Commuting Bicycle commuting is easier than you think, before you know it, you'll be hooked. Learn the tips, hints, equipment, safety requirements for safely riding your bike to work.

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Old 10-06-13, 05:27 PM   #1
trickdog
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1.5 inch tire on a 1.75 inch rim?

Looking to get back into full time commuting once the Orthopedic Surgeon finds out what is wrong with my knees. In the meantime and now that our local wet rainy winter is on the way, I have purchased a bike trainer to do some light indoor exercise.

My commuter is a MTB with a 26 x 1.75 inch rim on the back with a 1.95 inch slick tire. For riding my bike on the trainer, can I mount a 1.5 inch tire on that 1.75 inch rim? I asked at the local bike shop and was told no and that could only use a 1.75 or 1.95 tire on the rim.

Thanks in advance.
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Old 10-06-13, 10:59 PM   #2
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You measuring the rims themselves? or just the tire?

what rims are you talking about specifically?

what tool are you using to measure this?
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Old 10-07-13, 02:08 AM   #3
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Rim measurement: http://sheldonbrown.com/rim-sizing.html

Tire measurement: http://sheldonbrown.com/tire-sizing.html
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Old 10-07-13, 05:38 PM   #4
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You should have a sticker somewhere on your rim that says something like "559xNN",with NN the rim's width. Compare that to this chart to see what will fit:
http://www.schwalbetires.com/tech_in...dimensions#rim
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Old 10-07-13, 05:42 PM   #5
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I use 1.5 in slicks on MTB wheels made for any knobby tire. It works just fine. I don't see any reason why that wouldn't work for you too. Not sure what your bike shop is thinking.
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Old 10-07-13, 06:56 PM   #6
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Quote:
Originally Posted by trickdog View Post
Looking to get back into full time commuting once the Orthopedic Surgeon finds out what is wrong with my knees. In the meantime and now that our local wet rainy winter is on the way, I have purchased a bike trainer to do some light indoor exercise.

My commuter is a MTB with a 26 x 1.75 inch rim on the back with a 1.95 inch slick tire. For riding my bike on the trainer, can I mount a 1.5 inch tire on that 1.75 inch rim? I asked at the local bike shop and was told no and that could only use a 1.75 or 1.95 tire on the rim.

Thanks in advance.
1.75" rim width is something you'd see on a really fat beach cruiser or a snow bike - not your standard MTB.
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Old 10-08-13, 10:20 AM   #7
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Originally Posted by DiabloScott View Post
1.75" rim width is something you'd see on a really fat beach cruiser or a snow bike - not your standard MTB.
That depends on the bike, many older mountain bikes came with 26x1.75" rims. I have an old Ross that has them. I wouldn't put a 1.5 inch tire on them and there is really no need or advantage.
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Old 10-08-13, 04:56 PM   #8
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Thanks everyone. The rim is a MTB rim as I purchased it some years ago for this same bike. I tried the 1.5" tire on the rim last night then tested on the bike trainer and had no problems after an hour and a bit of riding on the trainer. I will see how it goes over the next few days and can always switch back to the 1.95" tire if need be.
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Old 10-08-13, 06:06 PM   #9
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I doubted you had such a wide rim , were just calling the tire the rim.
seems confirmed .

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That depends on the bike, many older mountain bikes came with 26x1.75" rims. I have an old Ross that has them.
Ross is just the brand they didn't make the rims , so still nobody measures anything.

I run 1.9" tires on my Snow Cat rims , they really are wide .. 45mm . or 1.5"

the tire takes on a straight sidewall D, shape. rather than a usual more round section.

Its running Studded tires, now..

Last edited by fietsbob; 10-09-13 at 08:59 AM.
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Old 10-09-13, 10:44 AM   #10
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Originally Posted by fietsbob View Post
I doubted you had such a wide rim , were just calling the tire the rim.
seems confirmed .



Ross is just the brand they didn't make the rims , so still nobody measures anything.

I run 1.9" tires on my Snow Cat rims , they really are wide .. 45mm . or 1.5"

the tire takes on a straight sidewall D, shape. rather than a usual more round section.

Its running Studded tires, now..
I fully understand that Ross didn't make the rims, they are Araya rims and are clearly stamped, 26x1.75, and are in fact 1.75.
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Old 10-09-13, 10:55 AM   #11
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that outside width of the rim? thats 48mm .. I dont remember them being that wide.
and I'm that old.
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Old 10-09-13, 12:11 PM   #12
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they are Araya rims and are clearly stamped, 26x1.75, and are in fact 1.75.
Those boogers are wiiiiiiiiide. I wouldn't feel comfortable with 1.5" tires in there... but what's the worst that can happen on a trainer? Maybe scare your dog when it blows out.

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Old 10-09-13, 12:36 PM   #13
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Those boogers are wiiiiiiiiide. I wouldn't feel comfortable with 1.5" tires in there... but what's the worst that can happen on a trainer? Maybe scare your dog when it blows out.
That is my point, if it is truly a 1.75 inch rim, I would never put a 1.5 inch tire on it.
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Old 10-09-13, 12:51 PM   #14
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That is my point, if it is truly a 1.75 inch rim, I would never put a 1.5 inch tire on it.
Sorry, I got you confused with the OP. We agree.
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Old 10-11-13, 11:01 PM   #15
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Chances are good that the 1.75" rims are only 25mm across on the inside, so a 1.5" tire would be fine by the ETRTO guidelines. I wouldn't go any narrower, though.

http://www.araya-kk.co.jp/rim/archive/1985/07-08.htm
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