Ataylor

Do any of you guys run this wheelset/tire combo? I was wondering if 28mm tubeless tires on a rim with a 19.5mm internal width would be an issue? Would that specific combination noticeably affect the benefits at all? The comfort, the speed, the preciseness of the ride or maybe even the overall balance? And at lower pressures? 70, 60 or even 50 PSI? What the conventional wisdom here?

I read a post that said the old rule of thumb was to double the number of the internal width and that would give you the size of the largest tire you can use. I think that thread was over 10 years old, though, so I'm not sure how true or relevant that information is today. So could you guys please shed some light on this for me? I'm assuming it shouldn't be an issue, but I'm not sure, so wanted to get some opinions before I make the purchase.

oldbobcat

That rule of thumb sounds a little optimistic to me, but you should have no problem running 28s on a modern Aeolus. Trek is shipping 28s or 30s on Domanes with that rim profile.

Ataylor

Oh, really? That's good to know. Thanks for sharing that. Makes me feel a bit more at ease with my decision.

smashndash

Yup, new ETRTO standards approve 28mm tires on upto 25mm rims. You run into some handling issues depending on the tire/rim combo (I'm using 28mm tires on 23mm rims) but it's not unsafe in the traditional sense.

Sy Reene

Not for nothing, but even looking at this outdated old ETRTO chart, 28s are fine on 19mm rims

Ataylor

Has this been proven or was this just your own experience? Either way, which tire/rim combos do you say have handling issues?

I know you said it's old and I don't know if I'm misreading the chart or if it's just outdated as you said, but was it suggesting that at one point they felt as though 25mm tires weren't a good fit for 19mm wheels but 44mm tires were?

Didn't know where to find the latest chart, but the one below suggests that a 19mm rim with a 28mm tire has "optimal" performance, while the 25mm tire is "compatible" and the 23 is "not suggested." Is this information up to date?

Sy Reene

If you're interested, this is a better more recent chart. It's for some reason hard to find others. From what I understand ETRTO has made compatibility now a 3-factor thing of Rim Width, Tire Width, and Max Pressure. This is for tubeless FYI (and hooked "TC" vs hookless "TSS"). For tubes, the guidance is you can add 15% to the tire pressures indicated (which are indicated in Bar, not PSI, so multiply by approx. 14.5 to get PSI). EDIT: Disclaimer I believe is that this is subject to the rim or tire manufactures claims about what they say their specific minimum/maximum recommended pressures are.

Taken from: https://engineerstalk.mavic.com/en/t...ght-rim-width/

Ataylor

Thanks for that. So Just to be clear, 19mm rims are compatible with 62mm tires, though at a little less than half the pressure?

Sy Reene

That's what the chart says. But the sidewall on actual 62mm tire might read a max value lower than the chart indicates, which is probably what should be followed.

Ataylor

Yep, got it. Thanks.