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From the XPower site:
Front suspension castor and a tuned power assistance valve maximise steering precision, driver feedback and stability. The chosen wheel and tyre combinations give impressive levels of grip. Standard on the ZR 160, optional on the other ZR models 17" diameter ‘Straights’ alloy wheels with 205/45 R17 tyres. For the other models there are 16" diameter, ‘Hairpins’ sports-style alloy wheels with 205/50 R16 tyres.
XPower ZR Page - Chassis
The R25/ZR chassis is basically the same - so go and get those 17" on!
From the XPower site:
Front suspension castor and a tuned power assistance valve maximise steering precision, driver feedback and stability. The chosen wheel and tyre combinations give impressive levels of grip. Standard on the ZR 160, optional on the other ZR models 17" diameter ‘Straights’ alloy wheels with 205/45 R17 tyres. For the other models there are 16" diameter, ‘Hairpins’ sports-style alloy wheels with 205/50 R16 tyres.
XPower ZR Page - Chassis
The R25/ZR chassis is basically the same - so go and get those 17" on!