Hi all,
Hope you are all keeping well 👍
My front wheel has a flat tyre. It will hold air for about 20 mins then goes flat. I think it's a fault with the valve
Question ...... What size inner tube do I requre for my M20? And where could I purchase one ?
Kind regards,
Mark
email (option): towersmark84@yahoo.co.uk
Standard tyre size for an M20 is 350 x 19"...If you ask for a tube for that size of tyre in any motorcycle shop or tyre outlet they should be able to supply...
It is still a size in current use on modern bikes....Ian
email (option): ian@wright52.plus.com
Or just close the with a good valve cover,
And see if the leak slows down,
But I think you would hear it or feel with your finger
If the leak was from the valve.
A flat tire in 20 min is big enough to detect, usually, if it is not inside the tire.
Anyway, the front inner tube is fast and easy enough and cheap to replace.
You do not even have to take the tire off the rim- you can just free one side,
But you would like to run your hand inside the tire BEFORE putting
The new inner tube in, in order to make sure that there is nothing inside that
Could puncture the new tube.
And- it is not a must, but if the new inner tube does not have a talc powder over it,
I usually spread a bit inside the tire before installing a new tube.
It helps the tube to find it's place easier.
And last advice
Be careful not to crush the new tube with the tire-lever when re-setting the tire.
It happens...
Noam.
I add "Slime" to my tyres. I refuse to say anything about its efficacy on the grounds that the god Sod is listening. 
email (option): Fergusanckorn@icloud.com
I was recently chastised here for a light hearted reply in a similar vein concerning carburetters...