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Tiger Cub fork springs

TogM
in Classic Trials

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Recently acquired a 1963 Cub converted to a TR20 replica complete with 3TA forks.

I am a relatively light rider (65kg) and find the suspension very hard and also noisy with the rebound 'slam'.

I am toying with the idea of fitting progressive springs (and possibly rebound springs) ??

The legs have casting numbers H1119 and H1120 (possibly suggests sidecar origins ??) with what I believe are a red/white marked 464mm long springs. The units themselves feel smooth and tight so I'm disinclined to dismantle them further.

Any experience, advice or suggestions for suitable solutions would be very much appreciated.

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