Author Topic: Tyre pressures 2-3/4 1912  (Read 545 times)

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Offline Jeff Swann

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Tyre pressures 2-3/4 1912
« on: 12 Mar 2020 at 16:23 »
Afternoon All,

On the final jobs before MOT next week, finishing off traffic cone brake blocks, bought a 10/11 guage spoke wrench so the drive rim is now without play & a few loose wheel spokes nipped up, new Ensign tyres & tubes but looking through my manuals no spec for Tyre pressures, can anyone please advise ??

Jeff

Offline tck

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Re: Tyre pressures 2-3/4 1912
« Reply #1 on: 12 Mar 2020 at 18:30 »
I have high pressures 50lbs on my bike since the tyres have no bead. Once when fitting a tyre and getting the tyre fitted to the rim I took it to 60lbs but I had the gauge upside down the tyre blew off at 90!

Offline cardan

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Re: Tyre pressures 2-3/4 1912
« Reply #2 on: 12 Mar 2020 at 21:22 »
I use about 35psi in 26x2 1/2, maybe 40psi in 26x2.

The reason information is scarce is that early tyres used Woods valves (rather than Schraeder as used now), and these didn't allow pressure to be measured. The instruction was usually to "inflate hard", but the weapon was a bicycle pump - I doubt 35psi was achievable by a mere mortal in the day.

Leon

Offline graeme

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Re: Tyre pressures 2-3/4 1912
« Reply #3 on: 13 Mar 2020 at 01:30 »
I pump BE tyres to 45psi. I know this makes the ride a bit firm, but having seen an under-inflated tyre blow out with disastrous consequences I will take the hard ride

Offline Jeff Swann

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Re: Tyre pressures 2-3/4 1912
« Reply #4 on: 13 Mar 2020 at 07:00 »
Thank you all for your replies

 I'll inflate hard for my trip to the MOT (Engineers report) & after I've ridden the pioneer run route next week on my Honda I'll make a final decision.

Thanks again

Jeff

Offline Hutch

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Re: Tyre pressures 2-3/4 1912
« Reply #5 on: 14 Mar 2020 at 22:22 »
There is a motorcycle tyre inflation chart in The Vintage Motorcycle Workshop by Radco on page 32. It is also referred to in this interesting discussion on the subject;

https://occhiolungo.wordpress.com/2012/11/04/clincher-tires-beaded-edge-tyres-pressures-and-installation-tips/

-Ian

Offline cardan

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Re: Tyre pressures 2-3/4 1912
« Reply #6 on: 15 Mar 2020 at 06:03 »
I've given my view on tyre pressures above: these apply to the correct combination of tyre and rim, fitted with a good quality tube. Re Ian's link: I'd pay more attention to Bevars' comments than the body of the article.

Let me comment on something that is not mentioned. In our bicycle fleet we have tyres from 28mm to 57mm width. A thin tyre requires higher pressure to prevent the dreaded "pinch puncture", caused when the tube is pinched between the tyre and the rim, usually when you hit a pot hole. So the minimum pressure is 60 psi (say) for a 28mm tyre, and 30 psi (say) for a 57mm tyre. Thus my suggestion to keep a 2" BE tyre inflated to a higher pressure than a 2 1/2" BE tyre.

BY FAR the biggest risks are, as mentioned by Bevars, (1) rubbish tubes and (2) tyres that don't fit the rim correctly. If you don't know what you're doing, make sure you check with someone you trust.

Cheers

Leon

 

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