Wheel builders such as Central Wheel should be able to source 17" rims with the correct spoke pattern and build them onto your hubs. It'll cost though...
Can absolutely see the appeal of racing supermotos, but I'd rather ride a road bike on the road. 2 stroke enduro engines aren't much fun in traffic or on a dual carriageway.
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'00 Montesa Cota 315R
'13 Husaberg TE 300
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