Submitted by FreeLander on Wed, 10/26/2016 - 19:27
Hi,
What is the correct tire size for this rim? Is it 28 x 1 1/2" (ISO 635?). Are these Endric or Westwood rims and will most tires fit these rims equally well? That is, is there different tires for the different styles rim?
The 28 X 1 3/4 designation was an English size which corresponds to the Canadian 28 X 1 1/2 size. Therefore, you can fit tires made for the Canadian market that have the 28 X 1 1/2 size markings, or generally any tire that is marked 700C with a bead diameter of 622 mm. The English tires marked 28 X 11/2 are meant for English 28 X 1 1/2 rims with a bead diameter of 635 mm.
Submitted by FreeLander on Wed, 10/26/2016 - 21:16.
Hi John,
Thank for your reply. Attached is a picture of the tire currently on the 28 x 1 3/4" Dunlop rim. I am concluding that this is a Canadian tire and 622. How can you tell and English tire (635) from a Canadian tire (622) if they are both marked 28 x 1 1/2 if they do not have an ISO number? I know this is part of the ongoing tire sizing saga that persons new to the vintage bicycle world struggle with.
If the tire is on the English 28 X 1 3/4 rim, it has to be a Canadian size 28 X 1 1/2 tire. Englsh tires with the designation 28 X 1 3/4 will also fit. The modern 700C tires will fit.
Please note that not all modern 700C tires are compatible with the older rims. While the bead seat diameter may be the same, modern folding and high pressure tires are designed for rims with hooked edges and will blow off the older, non-hooked edge rims. I'd stick to 700C tires with rigid beads and a maximum inflation pressure rating of no higher than 85 psi.
Daryl, have you seen the Sheldon Brown site yet? It explains the history of tire sizes. I searched for "bicycle tire sizes" on Yahoo and it was the first site to come up. Sheldonbrown.com/tire-sizing. As John explained, the numbers 622 and 635 refer to the diameter of the rim in millimeters from bead seat to bead seat (the place where the tire sits). There is a 13 mm or 1.3cm difference between those two rim sizes, which should be fairly easy to see with a measuring tape. Even with the imperfect situation of bending the measuring tape over or around the hub axle and guessing where the bead set spot is on the inside of the rim, you should be able to tell which it is, English or Canadian. Likewise, you could do the same measurement of a tire off the rim, ensuring the tire is not out of round while lying on it's side on the ground.
28 x 1 1/2 wo rim requires a 635 tire not a 700c(622) or a 28 x 1 1/2 f 12 canadian which is a 700c . this tire is still in production hope this clears things up for you . william rudolph
Hello,
The 28 X 1 3/4 designation was an English size which corresponds to the Canadian 28 X 1 1/2 size. Therefore, you can fit tires made for the Canadian market that have the 28 X 1 1/2 size markings, or generally any tire that is marked 700C with a bead diameter of 622 mm. The English tires marked 28 X 11/2 are meant for English 28 X 1 1/2 rims with a bead diameter of 635 mm.
John Williamson
Hi John,
Thank for your reply. Attached is a picture of the tire currently on the 28 x 1 3/4" Dunlop rim. I am concluding that this is a Canadian tire and 622. How can you tell and English tire (635) from a Canadian tire (622) if they are both marked 28 x 1 1/2 if they do not have an ISO number? I know this is part of the ongoing tire sizing saga that persons new to the vintage bicycle world struggle with.
All the best,
Daryl
...and that means that any of the modern 700c tires will also fit?
Thanks, Daryl
Hi Daryl,
If the tire is on the English 28 X 1 3/4 rim, it has to be a Canadian size 28 X 1 1/2 tire. Englsh tires with the designation 28 X 1 3/4 will also fit. The modern 700C tires will fit.
John Williamson
Thanks John. Perfect!
All the best,
Daryl
Please note that not all modern 700C tires are compatible with the older rims. While the bead seat diameter may be the same, modern folding and high pressure tires are designed for rims with hooked edges and will blow off the older, non-hooked edge rims. I'd stick to 700C tires with rigid beads and a maximum inflation pressure rating of no higher than 85 psi.
Daryl, have you seen the Sheldon Brown site yet? It explains the history of tire sizes. I searched for "bicycle tire sizes" on Yahoo and it was the first site to come up. Sheldonbrown.com/tire-sizing. As John explained, the numbers 622 and 635 refer to the diameter of the rim in millimeters from bead seat to bead seat (the place where the tire sits). There is a 13 mm or 1.3cm difference between those two rim sizes, which should be fairly easy to see with a measuring tape. Even with the imperfect situation of bending the measuring tape over or around the hub axle and guessing where the bead set spot is on the inside of the rim, you should be able to tell which it is, English or Canadian. Likewise, you could do the same measurement of a tire off the rim, ensuring the tire is not out of round while lying on it's side on the ground.
28 x 1 1/2 wo rim requires a 635 tire not a 700c(622) or a 28 x 1 1/2 f 12 canadian which is a 700c . this tire is still in production hope this clears things up for you . william rudolph