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Triumph Cub


danw43
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ive just bought my first trials bike a triumph cub,but it looks to me like it needs a wider swing arm sorting for it,does anyone have any drawings or dimensions for either making a new swing arm or modifying the original one,and does the engine have to be moved to the left to accomodate a 4.00 inch tyre so the chain runs true without catching the chain?

any info would be greatly appreciated as i need to get cracking as soon as possible

thanks in advance Dan

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if you want to widen the arm yourself there are drawings on this forum on how to do it. if not get on ebay or get someone like paul jackson ( details on yorkshire classic website) to make one for you. be aware though that once you change the arm ( which you really should) other stuff will need adjusting ( like wheel offset, engine offset rear shock location) you may not have to change anything you may have to 'adjust' the lot!

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can you offset the engine to the left and use a spacer ring to move the chain ring on the rear to suit,this would then keep everthing in line even the wheel would be kept on the c/l of the bike as far as i can see,the rear sprocket would have to be machined so the rear brake would fit inside i guess though,then everthing shimmed to suit,hopefully,regards dan

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