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tire size according to rim

Old 05-11-21, 03:37 PM
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oxfords1
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tire size according to rim

Hi All

I'm in the process of buying parts for a new mixte frame I bought "Some Buena Vista Rim" and I have some rims I'm looking at and I have questions regarding the tires that I can put on them.

The tires I'm wanting are either 26x1.25 or 26x1.5 or 26x1 3/8 Now the rim I'm looking at is
Velocity Dyad formerly known as Aeroheat 26 inch rim, 32 holed, Diameter 559, Valve presta, Tire type Clincher, Brake track machined,
I can't put a link since I haven't posted at least 10 but...... modernbike.com/velocity-dyad-formerly-known-as-aeroheat-26-rims has them

Will any of these size tires fit this rim?

thanks in advance
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Old 05-11-21, 03:45 PM
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26 x 1.25 and 26 x 1.5 are 559, they'll fit. 26 x 1 3/8 is 650A or 590 and obviously won't fit.
ETA: That was a .25 second google search.
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Old 05-11-21, 04:16 PM
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If you learn to look for the ISO size of the tire or rim.... Formerly the ETRTO size which it is still frequently referred as, then you will pretty much always know what size tire even stands a chance of fitting on a rim.

If you have the tire on the rim, then look for something like 40 x 559 embossed on the sidewall of the tire. Many time it is in the tiniest print. It should be obvious to you that the 559 matches what you state as the diameter of the rim. That is the bead seat diameter (BSD) and if both rim and tire have that same number, then you should be good.

Many new rims I have seen today usually have this somewhere on them. But some don't.

The other number is width in millimeters. On tires, that is the tire width... roughly. It varies sometimes a mm or so with different models and manufacturers. For rims, that number is the internal width from one bead seat to the bead seat on the other side. If you have a really wide tire with a really narrow rim, you might need to change your choice. Same for really narrow tires on really wide rims.

A lot of the online retailers are bad about listing the ISO size in the specs. But If you go to the manufacturer site for that tire, they will list the ISO or ETRTO size.


This was useful to me many years ago..... https://www.sheldonbrown.com/tire-sizing.html

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Old 05-11-21, 09:20 PM
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A link assist going to the correct website:
https://www.velocityusa.com/product/rims/dyad-26

I am assuming you have the 42 frame size on the Soma? That is the only one that comes in 26" which would be 559 ISO which those rims would work for and a 26.xx would work for. Fractional sizing will not work and is usually not found much these days in 26" sizing but Sheldon Brown has all the info on his site and Iride01 linked to the link that you want.

In terms of tires, tanwall or can it all. These would be great or if you are going the cheaper route Paselas pass muster.

The Buena Vista is ok but the Grand Randonneur would be my top choice (in the older version non-disc though not because I don't like disc) that is a cool frame for not a ton of coin and the use of Cantis or linear pull brakes with adaptors (as needed) allows wider tire clearance and potentially better braking than some of the long arm caliper brakes. It is a really neat rando bike which is not super common other than more custom options. If I had the space and the money to own a geared rando bike that I may not ride super often that would be on the list.
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Old 05-12-21, 09:17 AM
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thanks Cxwrench I went ahead and looked it up on google and figured it out. The cheeky comment wasn't necessary but whatever, I've always bought bicycles that were built, and never in my 6 plus decades have I ever had to build a bicycle so I figured asking seasoned folks who build their own or fix their own or even know this stuff would be a sure bet to get it right.

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Old 05-12-21, 09:19 AM
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Thank you so much Iride 01 you've been very helpful and thanks for explaining, I've never had to deal with this in the past and wanted to make sure I got it right before hitting the order button.
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Old 05-12-21, 09:23 AM
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Thank you veganbikes so much. yes it's a 42cm soma. thanks for all the info I really appreciate it. I've spent most of my time overseas in the military and just bought my bicycles, this is my first time having to build one and well I'm not good at it lol.
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Old 05-12-21, 10:08 AM
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Originally Posted by oxfords1 View Post
thanks Cxwrench I went ahead and looked it up on google and figured it out. The cheeky comment wasn't necessary but whatever, I've always bought bicycles that were built, and never in my 60 plus decades have I ever had to build a bicycle so I figured asking seasoned folks who build their own or fix their own or even know this stuff would be a sure bet to get it right.
Damn, you're older than I am
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Old 05-13-21, 07:39 PM
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Originally Posted by oxfords1 View Post
Thank you veganbikes so much. yes it's a 42cm soma. thanks for all the info I really appreciate it. I've spent most of my time overseas in the military and just bought my bicycles, this is my first time having to build one and well I'm not good at it lol.
We will need a pic when you get it!
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Old 05-23-21, 04:55 AM
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Damn, you're older than I am
lmao that typo made me seem like I'm a direct descendant of Moses's grandchildren
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Old 05-23-21, 07:30 AM
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Originally Posted by BlazingPedals View Post
We will need a pic when you get it!
I certainly will. It's hard getting components, I can't get rims that I want till the end of July. I had a custom-made Chas Roberts, touring bicycle made for me in England and I moved it to the attic a few years ago. When I had it made, I chose a man's frame to be able to hang extra bags on the tube but I now find it unnecessary and cumbersome to straddle that tube so we brought it down and started stripping it. I'll be able to put the wheels with different tires on the new one and most likely all the Shimano components, cogs, cranks, bottom bracket etc. I just ordered new calipers and should get them in by next week, I have a new handlebar, stem, headset, seat, seat post so it shouldn't take long to get it built with that old stuff. It'll do while I'm getting new components in, this old stuff just needs a little polishing to get the grime off. Here's a picture of my Roberts Rough Stuff touring bicycle. We had some awsome adventures together.

Chas Roberts custom made bicycles. Roberts Rough stuff
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