My new Giant Propel arrives tomorrow. It comes with SLR1 50mm deep hookless rims. Giant have included the Garvia Course 1 tyres, which are 25mm. They have an 85 psi to 125 psi pressure rating. The wheels apparently, like all hookless wheels, say do not inflate over 73psi to prevent tyres blowing off…

Giant dealer here. Giant wheels and tires, when used together, can be run at the listed max on the wheel and tire, which is usually 125. Yes, even hookless. So a 25c tire would have a minimum of 70, max of 125, although the calculator pretty much never suggests anywhere close to the max. A non-G…

[image] James_Broughton: Do your SLR2 wheels state the 73psi limit? Nothing I can see, and as you say, would fundamentally preclude 23 and 25 m tyres being used so… The 72.5 number mentioned for non-CADEX non-Giant tyres is a red herring. Given we’re using Giant tyres, and I would not extrap…

Thanks for coming online and sticking your neck out :wink: I’m happy we take what’s on the tyre as minimum and max - hard to argue against that. :+1: If we’re looking for optimal performance (getting faster) though - One of the points above is that silca uses a “measured” width, giant doesn’t stat…

[image] JoeX: [image] James_Broughton: Do your SLR2 wheels state the 73psi limit? Nothing I can see To further support @Wheatstraw53 s point, this review says the SLR2 50s have a max of 125psi: [image] Giant SLR 2 50 Disc WheelSystem Stable and confident wheels with wide, h…

Thanks so much. You made it very clear and it’s good to know. I’ll run the Gavias at 80psi as Silca suggests and eventually replace them when they wear out with some 30mm ones.

I’d personally ignore what the dealer said in this thread, and stick below 73psi. I suspect many others here are of that same opinion too…! I think they’re confused, and I think it’s very dangerous advice.

Here is Giant’s recommendation for a 23c on 19.4mm internal hookless rims with a max 129 kg rider. Hmm. Giant has it wrong then? Link to Giants tire pressure calculator: Tire Pressure | Giant Bicycles US [image]

The dealers words match Giants official marketing. As long as you stay with these tyres or other approved tyres, you can exceed the 73psi for hookless as long as you don’t exceed tyre psi limits or that of the rimtape. Giants hookless tech write up and tyre compatibility chart here And for your ot…

I must admit that I’m a bit surprised by @Wheatstraw53 information, and he seems correct. As long as you are using the Giant combo, you’re safe to exceed the famous 73.3/72.5 PSI.

Seems odd. Especially since that review mentions how easily the tyre goes on with a single lever. What’s their secret sauce? :thinking:

I think a lot of it is just that they’ve done the testing with those specific combinations to be confident that the setups are safe. Giant is traditionally a conservative company when it comes to safety so it gives me a lot of confidence in them. For their own tires, they use a combination of Kevla…

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Very confused pressure of 25mm tyres on hookless wheels

Equipment

libreus September 21, 2024, 9:55am 36

have a great one! really beautiful. this one’s mine:

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