Technical > Wheels, Tyres and Brakes

Advice on picking the right rims for my set up

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Andre Jute:

--- Quote from: JohnR on May 28, 2024, 01:51:00 PM ---Ideally, IMO, the inner rim width wants to be about half of the tyre width you plan to use.
--- End quote ---

Good sense.

However, in this case where the cyclist is already hard up against a real shortage of options in the market, it is worth mentioning that the ERTRO engineers originally (before some rim makers without wide-rim capability started politicking) specified that the inner rim width should not be less than 40% of the tyre width. That means a tyre up to 2.5 times the widest rim he can find which meets his other desires.

I run 60mm tyres on rims 25mm across the beads -- that is, 42% of tyre width -- and have never had a problem because of it, even though I operate the tyres at what most here would consider really low pressure, down to 1.5bar at the end of the month before I inflate again. Where I live, all the flat roads are crowded and dangerous, so I ride the hills up and down, and have had plenty of opportunity to observe that those ERTRO engineers' initial 40% was a wise compromise.

JohnR:
I've clocked up many miles with 50mm tyres on 17mm internal width tubeless-ready rims. I think that such rims, designed to hook onto the tyre beads, have enabled the tyre width / rim width limit to be increased. I also feel that a light bulb-shaped tyre gives a more comfortable ride than a U-shaped tyre.

Dunroving:
I had a similar, but even more challenging job of looking for a combination of old and new tech (QR, rim brake, tubeless ready), except I was looking for 26 inch rims also. I ended up going with Velocity Cliffhanger rims, and I note that they also come in 700c. I don't know if they tick all of your boxes, but worth taking a look at their site. I purchased from a UK retailer, but I'm pretty sure you can also buy direct from their US site. You might find some helpful information in my thread on the topic in this forum.

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