Hoopdriver

I'm upgrading a 29er and want to mount wider tires than the originals 35-622s. Width is not an issue; the limiting factor is the diameter of the tire. I figure that my max diameter is about 720mm, equivalent to a circumference of 2260mm. Browsing the websites of manufacturers (and other "authorities") leads me to believe that ISO widths of up to 50 may be possible; however the available info is inconsistent. I was hoping to get some feedback from actual users.

I would very much appreciate anybody using tires of ISO 45-622 to 50-622 taking the time to measure and post diameter or circumference of mounted tires. Also include manufacturer, model, ISO designation, and also what rim they are mounted on.

Thanks

308jerry

I'll check back in with you in a couple of days. I have a Trek DS 8.4 that came with 700x38 on it I ordered some Schwalbe Hurricanes 29x2.0 which are actually 50mm wide that were supposed to be here yesterday but bad weather has delayed delivery.. In the Hybrid forum I was told they'd fit, we'll see .

GrainBrain

Just grabbed a rough estimate from my 29er front tire, distance from center of wheel to outer tire is about 35.5cm (radius) so about 710mm diameter.

Continental xking 2.2" (55-622) mounted on giant s-xc2 rims, I think they have a 17mm internal rim width.

fietsbob

ETRTO data is marked on the side of the tire .. 29er bead seat is 622 - ( xx ) XX being width in mm..

rumrunn6

why would this be the case?

rumrunn6

dunno if this will help you. just measured what I have handy outside

50 622
28x2
schwalbe marathon winter studded tires
at 30psi

approx diameter 28 3/8" or 720mm?
maybe a tiny bit larger cuz my ruler's left edge was to one side of the front axle





on these Alex rims


& fwiw ~ this is their width measured (47mm?) when mounted at 40psi

Hoopdriver

Because of the limited distance between axle and fork crown (front) and bridges (back). Too tall of a tire would rub.

rumrunn6

what 29er do you have? on my GT the closest point seems to be the chain stay

these are my 29x2.25 Riddlers. this angled thing is a DIY debris deflector

Leebo

Rim widths matter too. Most 29ers should be able to take a 2.1 to 2.4. Your 29er came with 35 mm tires? So that is a road bike or hybrid? Make and model of your ride?

63rickert

This is a useful utility:

https://www.yojimg.net/bike/web_tools/trailcalc.php

Enter wheel size and tire width and it will give a wheel diameter and radius. Not possible to be spot on every time. My experience is the numbers are usually a bit high and rarely too low.

Darth Lefty 

Hoopdriver

Have you gotten them yet? Those tires at that size is on my list of possibilities.
Thanks
Thanks. The pics were great. 720mm would allow me about 5 mm clearance at closest interfering point.
My closest point is the seat stay bridge but by only a few mm over the fork crown and the chainstay bridge
Bike is a 2014 Kona Dew, which I bought on CL for a give-away price. The plan is to strip it of all the lower level components and build it as a bike that will handle a rougher terrain better than the road bike that I use as a "gravel" bike. It's a hybrid, but definitely marketed as more of an urban bike. It rides well and I think with a bit of tweaking it will be a nice bargain addition to the stable. The more recent Dews are fitted with wider 650b tires. Since I'm building new wheels for the upgrade, I had thought about going the 650b route, but this frame has v-brakes, not disk, so not so easy.

Thanks, You're right, the numbers seem high compared to some of the manufacturer's data.


Browsing around, I found this Wheel Diameter Visualizer. Developed by Dan Stroud. Neat stuff. He has a tire measurement database that has a lot of info but needs to be fleshed out a bit for some manufacturers, hence is invitation to add data.

Thanks to all who have responded

308jerry

Got one of the Schwalbe Hurricanes put on tonight. With 48 psi in them on 17mm wide rims they measure a tick under 2 inches wide on the lugs and right at 28 and 3/8ths inches tall. Hope that helps.

Hoopdriver

Yes it does. The diameter you measured is right at my limit, but would still fit. I'll be using 22mm rims, though, which should result in the tires being wider and have lower diameter.

Thanks