Just measured the inside width of the rim and I got approx. 1-1/8" or 30mm! My bike is fairly old and maybe the rim is not even a standard size?!

Please help

If you truly are currently running 26 X 1.95, I can't imagine 26X1.25 not working. If they don't, Nashbar will take them on return.

Based on what I see on my current tire, it stated 50-559, 26x1.95 on it. I thought 26x1.25 should be fine, but there is another user who mentioned about the width of my rim should be 17mm or 19mm and if anything bigger than 21mm, I will have a problem with the 26x1.25 tire on my wheel. Btw, I measured my inside width of my rim, it's approx. 30mm.

Tell us about the bike if you haven't already. Do you know the brand or model? That may give us an answer.

It's a Raleigh Discovery MTB that from wayyy back, 1995 or 96? Maybe I should go to the C&V forum. :rolleyes:

This is the model of bike I have. Bike in the pic isn't mine, I just googled it.
http://img1.classistatic.com/cps/kj/...145992_18.jpeg

My money is on the 1.25's working. :)

Based on the charts on our website, it's highly unlikely that the rim is 30mm wide. The widest rim on our chart is a 29mm, and it wouldn't have been the right size rim (too wide) for the tire you have.

I don't want to ask silly questions, but did you take the tire off and measure the inside width? (see "B" in the diagram below.

Which tire fits which rim?

http://www.schwalbetires.com/images/e_img1_1149.gif
The inner diameter of the tire must match the rim bead seat diameter. For instance a tire size 37-622 fits on a 622 x 19C rim. The inner diameter of the tire corresponds to the rim bead seat diameter of 622 mm. Furthermore, the tire section width must match the rim width. The following table shows possible combinations of tire section widths with rim widths according to ETRTO.
European Tire and Rim Technical Organization Standards Manual - 2007

I confused on what you mentioned earlier and I measured the other side of the rim (in this case, I'll called that OUTER width of the rim) I will remove the tire/tube tomorrow and check once again. Thanks for your help.

Not to be an a$$, but maybe you should go to a bike shop ahson. It sounds like from your description and your posts you might need more help than what we can provide or maybe just Kojak has been providing :thumb:. Ask if your bike will fit a 26inch 1.25 tire and if they have any in stock. You don't necessarily have to buy it from them.

Don't get me wrong ahson, I applaud your willingness to learn and work on your bike yourself. But sometimes we all need a little extra help (at least more than the internet can provide). Just yesterday I took a bike into my LBS to repair a flat tire :twitchy:. Plus it may give you an excuse to buy that new bike you've been eyeing :innocent:.

Maybe we can attack this from a different angle. Are there still decals on the wheel that denote rim manufacturer and just as important, the model number of the rim?

http://img245.imageshack.us/i/4edit.jpg/

http://img245.imageshack.us/img245/3087/4edit.th.jpg Please click on the thumbnail to have a better, bigger picture. Should I measure the red line part width or the black line part?


http://img36.imageshack.us/img36/6104/17424858.th.jpg Another pic to show how wide/narrow? my rim is...


http://img245.imageshack.us/i/4edit.jpg/

Awesome picture, actually, you measure the distance between the lips just below the black line.

It does look awfully freaking wide though.

is that strip tire liner?

If I understand your question, the black band is a rim strip. It can substitute for rim tape to keep the tube from inflating into the spoke nipple voids, ultimately causing a tube failure.

http://img299.imageshack.us/img299/5017/img0516p.jpg http://img299.imageshack.us/img299/i...jpg/1/w480.png

http://img299.imageshack.us/img299/6719/img0517a.jpg http://img299.imageshack.us/img299/i...jpg/1/w640.png

I put a piece of paper to fit inside the rim and then I measured that piece of paper. I got 28mm as the width and yes I am currently running Kenda 26x1.95 tire on this wheel.

That's one wide rim by today's standards. I've got an early 90s Cannondale MTB at home, now I'm going to go home and see if it also has wide rims.

At any rate, It appears that you have the minimum size tire that will safely fit on that rim. Click this link: http://www.schwalbetires.com/tech_info/tire_dimensions
and scroll to the bottom. You'll see a chart with "rim widths" on one side, and "tire section width" across the top. A 26 x 1.95 is roughly a 49-559 tire (1.75 = 47; 2.00 = 50)

By reading the chart, you'll see that the tire you have fits the very minimum range of the tire section width for the rim width that you currently have.

The risk you run by putting too narrow a tire on a rim is that the bead hooks on the rim won't sufficiently grab the bead hooks on the tire. As you progress toward max inflation, you run the very likely risk of blowing the tire off the rim. If this occurs, your tire will likely sustain bead damage, and since the wrong size tire was being used for this particular rim, it's unlikely to be a warranty issue. I'm not sure how liberal Nashbar's warranty policy is. If you catch our warranty guys on a good day, you might get some sort of discount on a replacemnet, but this technically wouldn't be a warranty issue.

Hope this makes sense.

Ahhh I guess I will have to try and cancel my order from Nashbar then. Thanks for your help! Much appreciated. :thumb:

I'm no expert obviously and don't want to give the impression that I know even half of what Kojak knows but I still say they fit. I've had mountain bike rims that have had over 2 inch tires on them that handled the 1.25's just fine. Cancel the order if you don't want to go ahead and try it, I guess I can't blame you. Maybe you could get some 1.50's instead. That's what I'm running. Seems like a more versatile tire to me anyway.

I kinda measure the inner rim width once again and I confirmed it should be 25mm - 25c wheel and so the smallest tire I can put on is 26x1.75 (according to the tire dimensions chart).

Daredevil, I am still deciding whether I should give it a try or not. Thing is it might be a bit too late for me to cancel my order now.

I still think the bead of that tire will spread plenty wide to fill your rim.

My money's still on them working. I am ready to eat crow if they don't.

It's probable that they'll fit on the rim, and quite possible that they'd work. All of this I agree with.

However, there is a very distinct risk that while rounding a corner, or descending down a hill, you could blow the tires off the rim, especially when inflated to maximum psi. Even as an experienced cyclist this is a scary proposition. It's very likely that Nashbar will exchange them for 1.75s and you'll have the peace of mind that you have the right tire/rim combination. I would also say that from experience, you'll have a much more difficult time exchanging tires that have been mounted as not many people want "used" tires at a new price.

point taken....:thumb:

If by "theory" one means "what people who don't rtfm" think, then yes! It's nice to find someone who has actually checked the facts.

Wet and dry grip and puncture resistance will also vary with model. Probably the best fast slick at the moment, all taken with all, is the Rubino Pro 1.5. Fatboys are fast, but they lack wet grip. Conti Sports Contacts are good too - again some people complain at the wet grip, but I thought it was acceptable.

I'm not familiar with the puncture protection system on the Rubino tire, I assume from your comment that it's fairly grippy. Our best road commuting/touring slick is the Marathon Supreme. It's a fair bit more money than the Rubino, but it's made from the same compound as our racing tires which means it's very grippy wet or dry, and has a very advanced Vectran/Ceramic guard puncture protection. Just sayin.
Our biggest problem this year has been keeping them in stock.

Not try to bring up this same topic once again, but when I asked Nashbar about my order cancellation their tech told me this theory:

How Narrow = not < inside rim width
How Wide (ATB) = not > 3 X inside rim width
How Wide (Road) = not > 2 X inside rim width

Am I missing something? My MTB inner rim width has approx. 27-29mm = 1.06"-1.14". Tires that I ordered are 26x1.25" - 1.25" = 31.75mm.
Tires that I ordered are not < inside rim width. I am a bit confused now because it's just a totally different thing than what I read from the tire dimension chart.


Thanks