See here:
http://www.british-customs.com/british-customs-wide-rear-wheel-kit-18311.html

But you could also go the way of a Thunderbird Sport (T 300s) wheel-conversion.

But: Fatter wheels do not make it more rideable. Better way ist to use a stock Tiger rearwheel from the first 900 series with a 3.00 rim. Big improvement for riding...

Dan

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