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walkertrials

Rear tyre size?

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I'm recreating the bike my Dad built for me in the 60's I have a standard bantam 18 incch rear wheel currently fitted with a 3 inch road tyre my question is will this rim accept a 4 inch wide tyre or do I go for a 3.5 tyre. Swing Arm is a Triumph factory trials wide.

20200228_122942.jpg

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You should be OK with 4 inch. You can space the sprocket left slightly by putting a washer between it and the hub then counterboring the sprocket slightly to clear the brake plate (mine wore it's self one but this was 30 years ago, nowadays I would put it on the lathe).

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Teamferret thanks it is a wide swing arm & now you've said the s/h sprocket I have bought is counter bored, but is a 4 inch tyre OK on this rim?

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How wide is the rim, as wider the rim is as better will be the footprint of the trials tire?

2,15 is a good width, anything less - as twinshockes and most air cooled monos had,
is not as good in terms of traction.

Twinshocks and air cooled monos had often just 1,85 as rim width.

 

Edited by pschrauber

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It will go on, but you might find it difficult to keep it on if you run really low pressures, it will slip back into the well of the rim

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Teamferret thanks should be OK then to ride to sections when observing & do the odd dead easy trial I can leave a bit more air in, thanks.

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