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Tyre Pressures

TP markings on front mudguard.. I think it reads;
TP
F18
R20

https://www.iwm.org.uk/collections/item/object/205418173

email (option): richardpurkiss@hotmail.com

Re: Tyre Pressures

1940 handbook tyre pressures not to be considered for soft modern Neoprene? tyres though. Ron

email (option): ronpier@talk21.com

Re: Tyre Pressures

Tyre pressures were altered several times during the war years according to the list of DME circulars. Unfortunately we only have the list not the circulars.

B.200 20/03/42 Tyre pressures (cancelled by B.400) All M/Cs
B.400 21/01/43 List of tyre pressures (cancels B.200) All M/Cs
B.400/1 12/5/43 Amendment to B.400 All M/Cs

There are several possible reasons, a shortage of rubber meant tyres contained more synthetic compounds, tyre life, and the governments attempts to help fuel economy.

Rob


email (option): robmiller11(a)yahoo.co.uk

Re: Tyre Pressures

The quoted pressures for wartime tyres are definitely not suitable for modern tyres...

Wartime pressures in modern tyres can make the bike pretty unstable...The Dunlop K70 Gold Seal tyres favoured by many current riders for example, have relatively weak sidewalls and rely very much on internal pressure for stiffness...Getting a puncture in a K70 soon illustrates that point...

Sometimes originality isn't the best plan!!..:laughing: ....Ian

email (option): ian@wright52.plus.com

Re: Tyre Pressures

The tyres fitted on mine are the Ensign, they were on it when I got the bike.What would be the recommended pressures to run these at, 14st sat astride it :)

Thanks
Dave

Re: Tyre Pressures

I have an Avon on the front of my M20 and a Mitas on the back. i run around 25 on the front and 30 or just over on the rear. It works fine for me but you will have to experiment yourself. I think your Ensign's will have fairly soft tyre walls as the Mitas on the rear of mine.

email (option): t.j.walker@btinternet.com

Re: Tyre Pressures

I'm running 30psi front and rear with Mitas tyres. I'm usually 2 up but even solo it handles well.

email (option): horror@blueyonder.co.uk

Re: Tyre Pressures

Thanks Tim. I've just replaced my rear wheel and taken off and replaced the tyre back onto the new wheel , yes they do have soft walls very easy to change which was a pleasant surprise .

Dave

Re: Tyre Pressures

Thanks Horror , that's another thing I need to find out what's a good all round weather tyre to fit to the M20's ? As you will have probably realised I'm new to the BSA M20 scene and its still a big learning curve I'm on , 2 strokes have been my thing in the past myself racing (20yr ago) and now both my lads do it .

Dave

Re: Tyre Pressures

From racing a two stroke to riding an M20, now that is a big difference....

Re: Tyre Pressures

Aye its certainly opened my eyes up :laughing: its certainly a different beast to ride

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