Help! Overwhelmed by tire numbers

Pscycle

Hi,

Really hope someone can help me out, trying to replace tire on my Raleigh hybrid, have tried multiple Evans shops, and two Schwalbe tires and they both seem far too big. The measurements are like algebra to me at this point, would be very grateful if someone can translate them into something that tells me what I need to buy.

Old tyre: (37-622) 28 X 1 5/8 X 1 3/8 MI-2704-2
Replacement #1: 28-622 (28 X 1.1-700 X 28C) HS 348
Replacement #2: 37-622 (28 X 1 5/8 X 1 3/8 - 700 X 35C) HS 348

All I've garnered from the internet so far is that if the 622 number is the same, they should fit, which it is and they don't. My old tire seems much narrower.

What am I doing wrong?

Thank you!

flea72

The width of tyre, just helps with speed.

As long as the diameter matches, they should fit your rims.

28" is an odd size. Most mtbs are 26" and racer tyres are 700mm. Hybrids tend to run on racer tyres, so 700s.

In what way do the replacements not fit?

flea72

Have you tried measuring you rims?

The_ICT_Engineer

Pscycle wrote: »

Hi,

Really hope someone can help me out, trying to replace tire on my Raleigh hybrid, have tried multiple Evans shops, and two Schwalbe tires and they both seem far too big. The measurements are like algebra to me at this point, would be very grateful if someone can translate them into something that tells me what I need to buy.

Old tyre: (37-622) 28 X 1 5/8 X 1 3/8 MI-2704-2
Replacement #1: 28-622 (28 X 1.1-700 X 28C) HS 348
Replacement #2: 37-622 (28 X 1 5/8 X 1 3/8 - 700 X 35C) HS 348

All I've garnered from the internet so far is that if the 622 number is the same, they should fit, which it is and they don't. My old tire seems much narrower.

What am I doing wrong?

Thank you!

Almost all tyres are now marked according to the International Standards Organisation (ISO) (37-622) in addition to the more common markings. The ISO size comprises two numbers separated by a dash. The three-digit number after the dash is the most important. This is the bead diameter at which the tyre fits onto the rim. That initial two-digit number is the tyre section and indicates the tyre width. It is common to use Metric size in your case.

What you are looking for is 700 x 37c, As for tyre I would recommend the Continental Sport Reflex 700 x 37c which are the ones that I use. Schwalbe tyres tend to be a loose fit.

http://www.ebay.co.uk/itm/291039878524?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

Pscycle

flea72 wrote: »

The width of tyre, just helps with speed.

As long as the diameter matches, they should fit your rims.

28" is an odd size. Most mtbs are 26" and racer tyres are 700mm. Hybrids tend to run on racer tyres, so 700s.

In what way do the replacements not fit?

Thanks - both seem far too wide in comparison with the old one, and I can't get them into the rim. Bike is Raleigh 700cc (traditional shopper...).

Pscycle

flea72 wrote: »

Have you tried measuring you rims?

Thanks - how do I do this, ie which part do I measure? Width?

Pscycle

The_ICT_Engineer wrote: »

Most tyres are now marked according to the International Standards Organisation (ISO) (37-622) in addition to more familiar markings. The ISO size comprises two numbers separated by a dash. The three-digit number after the dash is the most important. This is the bead diameter at which the tyre fits onto the rim. That initial two-digit number is the tyre section and roughly indicates the tyre width. Its actual width is normally less, but varies according to how the tyre is designed and the width of rim to which it is fitted. It is common to use Metric size in your case.

What you are looking for is 700 x 37c, As for tyre I would recommend the Continental Sport Reflex 700 x 37c which are the ones that I use. Schwalbe tyres tend to be a loose fit.

Thanks - yes they do seem far too loose. No way I can get them into the rim. I will try a 700 X 37C one, but am confused - if the ISO number is the one that is meant to count, why don't either of the replacements with this same number fit? Maybe the wheel rim is far too narrow, and original tyre was mislabelled? If I refit the old one and measure it across, and it does turn out to be narrower, would I then try a 25-622 tire for example?

flea72

Easiest way is to take old tyre into shop and find match, or take whole wheel in and leave it to experts. Im surprised that Evans havent suggested this if you have already returned 2 tyres to store

Si_Clist

Hang on, hang on ... something's not right here. If the original tyre was a 37-622, a replacement 37-622 should fit. It might not be a doddle to get on, but it should fit.

If yours is a traditional Raleigh bike, both wheels will be the same size. Have you checked that the other tyre on it is a 37-622?

What's really got me confused though is when you say "they do seem far too loose. No way I can get them into the rim" when if you can't get a tyre "into the rim" I would have expected that to be because it's too tight, not too loose.

When you started to put the second replacement onto the wheel and you worked your way up towards the last bit to get over the rim, was that last bit of tyre too tight to go over the rim, or did it slip over with room to spare?

Avoriaz

Have a look at this site.

flea72

Si_Clist wrote: »

Hang on, hang on ... something's not right here. If the original tyre was a 37-622, a replacement 37-622 should fit. It might not be a doddle to get on, but it should fit.

If yours is a traditional Raleigh bike, both wheels will be the same size. Have you checked that the other tyre on it is a 37-622?

What's really got me confused though is when you say "they do seem far too loose. No way I can get them into the rim" when if you can't get a tyre "into the rim" I would have expected that to be because it's too tight, not too loose.

When you started to put the second replacement onto the wheel and you worked your way up towards the last bit to get over the rim, was that last bit of tyre too tight to go over the rim, or did it slip over with room to spare?

I got the impression they were loose as the diameter was too big. But didnt fit the rim, because they were too wide