28 tyres on a wtb i23 rim

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This topic has 11 replies, 8 voices, and was last updated 5 years ago by johnnystorm.

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28 tyres on a wtb i23 rim
whatyadoinsucka
Free Member

Hi guys
I’ve limited knowledge of tyre sizes on drop handle bikes and compatibility

i’ve just ordered a topstone gravel bike that comes tubeless ready
wheel rims: WTB ST i23 TCS, 28h, tubeless ready
and WTB Riddler TCS Light, 700 x 37c, tubeless ready tyres. [437 grams]

I’m doing a bike challenge with roadies over 3 days madrid to bilbao in october..
so i am thinking of putting some lighter 28mm tyres on..

a mates recommended me Continental Grand Prix 4000S II Folding Road Tyre for better rolling,
would these work on a wider tyre rim that is tubeless ready, i just intend to use tubes.
once i’ve done this event i’ll use the bike local towpaths and woods etc, so plan to go tubeless with 37c tyres

TIA

Posted 5 years ago

kerley
Free Member

I wouldn’t worry about the size but there may be a max pressure issue. Some of the Mavic 29er rims have max recommended pressure of 45psi so running a 28 at 80 or 90 may not be a good idea. Can’t find any info on i23.

Posted 5 years ago

molgrips
Free Member

Don’t think you’ll get 28 tyres on there. 1 is the usual.

Posted 5 years ago

IvanMTB
Free Member

I’m running 28c tyres on my commuter on 19mm internal width rims. It gives nice, round, fat profile. Done tubeless actually gives almost 32mm of real life tyre width.

i23 is 23mm internal width. So in theory might not be that bad. The worst case scenario it would be slightly wider but more square/flat tyre profile.

80-90PSI… I would never understand it. True story, I’m lightweight (10.5st) but I’m not running my tyres higher than 45-50PSI. Occasionally as low as 30-something…

Cheers!
I.

Posted 5 years ago

whatyadoinsucka
Free Member

Thanks guys I’ll get them bought

Posted 5 years ago

cookeaa
Full Member

I just put a 32c cross tyre on a 25mm internal rim and as I’d spotted this thread earlier thought I’d just put the verniers across it; came up just shy of 34mm wide, but still with a nice rounded shape.

So yep OP I reckon your 28c will maybe come up 29.5-30mm-ish…

Posted 5 years ago

legometeorology
Free Member

I’d probably not wanna do it… WTB say no, and they are quite generous with their recommendations:
https://www.wtb.com/pages/tire-rim-fit-chart

Perhaps go for something like Gravel King slicks in 32mm? They’re super fast and very light.

Posted 5 years ago

n0b0dy0ftheg0at
Free Member

On 23mm internal, I’d only “risk” generously wide 28mm like GP4000S IIs, that measure ~31mm wide in real life conditions.

28mm GP 4Seasons and GP5000s measure ~29mm wide, I wouldn’t fit them on those rims.

Posted 5 years ago

kerley
Free Member

I’d probably not wanna do it… WTB say no, and they are quite generous with their recommendations:
https://www.wtb.com/pages/tire-rim-fit-chart

28 is ‘not suggested’ yet 30 is ‘optimal’ 2mm between don’t do it and optimal doesn’t sound very scientific. What do people think will happen as I have used narrow tyres on wide rims for years?

Posted 5 years ago

whatyadoinsucka
Free Member

thanks guys for the further comments, i bought the 4000s so will put on and measure them, if as nobodyofthegoat says measure wider, I’ll try them out..

pick the bike up friday so will run with the 37mm standard tyres it comes with and see how it runs compared to my diverge with 28mm spec roubaix on it..

Posted 5 years ago

paton
Free Member

https://janheine.wordpress.com/2018/01/03/12-myths-in-cycling-1-wider-tires-are-slower/

Posted 5 years ago

johnnystorm
Full Member

I’ve fitted Hutchinson 28s tubeless on i23 rims. No probs.

Posted 5 years ago