Tyre Pressure Question- Mtbr.com
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  1. #1
    mtbr member
    Reputation: drofluf's Avatar
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    New question here. Tyre Pressure Question

    Just fitted the tyres for the first time - Endomorphs on Fat Marge rims and had to put them to over 20psi before it felt that the tube was 'filling' the tyre which was higher than I expected.

    Is that about the right pressure to start with?

    Is it OK if the tyre moves on the tube?

    Thanks
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  2. #2
    is buachail foighneach me
    Reputation: sean salach's Avatar
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    1- It's not ok if the tire is loose, or moves on the tube.

    2- 20 is a little high to start with. 14-16 would be a better starting point.

    Try letting the tire/tube sit at 20 psi over night. The tube should stretch out and fill the tire better. If it doesn't, you might need a new tube, possibly a different brand.

  3. #3
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    What sort of tubes? I don't have this with the Surly tubes, but when I use smaller diameter ones, then as per Sean.
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  4. #4
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    Thanks for the replies.

    Sean - I've left them inflated so I'll see in the morning

    Velobike - I'm not sure, they came with the bike which I got on eBay and picked up yesterday. My guess is Surly since everything else is....

    Of course the other thing could be the gauge on my pump, I'm not sure how good that is
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  5. #5
    Geordie biker
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    It's common for them to appear loose until about 5psi onwards, intend to inflate to 10-15psi when sticking new tires on and leaving them or go for a ride straight away to seat them.

    20psi seems a tad much to get them to settle in place, they must be normal or dh tubes and not surlys?
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  6. #6
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    You probably need bigger tubes. 20 psi is for ridding pavement, tire pressure is everything.

  7. #7
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    Quote Originally Posted by GTR2ebike View Post
    You probably need bigger tubes. 20 psi is for ridding pavement, tire pressure is everything.
    I totally agree. For me, there's a pretty strict "sweet spot" that makes the whole fatbike experience. It's around 6-7 psi.

  8. #8
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    Quote Originally Posted by SmooveP View Post
    I totally agree. For me, there's a pretty strict "sweet spot" that makes the whole fatbike experience. It's around 6-7 psi.
    Agreed. 6-7psi is perfection.

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