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Fanny B

Rim sizes

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Hi all, will a  WM3 X 18 X 40 rim be ok for a 4 inch trials tyre? I`m sure I used a wm3 on the back of my Matchless but it was a long time ago. Also does the "40" refer to spoke holes? If it does it`s no good for me.

                                         Thanks in advance, Hazel

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WM3 (2.15) is what moden trials bikes use at the rear. In the 1970s WM2 (1.85) were not uncommon. WM1 (1.6) is for the front.

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