What difference did it make to performance?

the CR accelerates slightly quicker - but runs out of "steam" earlier.

The gearing does make a CR more rideable round town though.

To do it you will need to change the sprockets, swing arm and belt, and it will need a reflash to a CR ECM - can't remember if the IC need updating as well or if it's covered by the ECM ...


... or IIRC, a guy in the States made up a new tension pulley with a different diameter and kept the existing swing arm - the info will be on BadWeatherBikers somewhere.

Thanks for that, I was expecting to have to mess about changing the swinging arm or tensioner pulley so I guess I'll stick another standard belt back on.

What is different about the swining arm then?

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08 Specialized Langster

The length I believe.

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2001 X1 2009 1125CR 2006 Uly X3 2010 Uly a fully Maz'd S1 and a 1991 RS1200 Westwind.

IIRC the CR swing arm is about 5 mm shorter than the R.

Which is almost certainly too much additional slack to take up with a Willy tensioner. 5mm would equate to more than "a couple of flats" adjustment on a chain set up.