The front sprocket you need is the same as an XB, the rear is tuber specific, however you can buy a 61T for a Sportster and bore the centre out. I had a few sprockets hanging around from a few projects that I sold for £65 each (plus one or two from a mate building a chopper), which may have been a little cheap.
I have never actually ridden a non-US geared tuber.
With a bit of searching on tinternet, I found this:
Quote:
Euro is a 29/55, which is a 1.89 final, with a 29/61, you'd have a 2.1. US spec is 27/61, 2.26.
PART NUMBERS (may be obsolete):
A 29 TOOTH = 40205-95
A 27 TOOTH = 40288-95
B 55 TOOTH = 37727-97Y
B 61 TOOTH = 34927-94Y
The different combinations are:
A = 29 TOOTH B = 55 TOOTH
This is the "normal" UK spec and gives an overall gear ratio of 3.034.
Top gear - 24.02 mph/l000 rpm giving a theoretical top speed of 163 mph at 6800 rpm.
Fourth gear - 20.36 mph/1000 rpm - maximum speed 138 mph.
Third gear - 16.80 mph/1000 rpm - maximum speed 114 mph.
Second gear - 12.19 mph/l000 rpm - maximum speed 83 mph.
First gear - 8.93 mph/1000 rpm - maximum speed 61 mph.
At 80 mph in top gear the engine is running at 3300 rpm.
A = 27 TOOTH B = 61 TOOTH
This is the "full" US spec and gives an overall gear ratio of 3.615.
Top gear - 20.16 mph/l000 rpm giving a theoretical top speed of 137 mph at 6800 rpm.
Fourth gear - 17.08 mph/l000 rpm - maximum speed 116 mph.
Third gear - 14.10 mph/1000 rpm - maximum speed 96 mph.
Second gear - 10.23 mph/l000 rpm - maximum speed 70 mph.
First gear - 7.49 mph/l000 rpm - maximum speed 51 mph.
At 80 mph in top gear the engine is running at 4000 rpm.
A = 27 TOOTH B = 55 TOOTH
This is the US engine sprocket with the UK rear wheel sprocket to give an overall gear ratio of 3.259.
Top gear - 22.36 mph/l000 rpm giving a theoretical top speed of 152 mph at 6800 rpm.
Fourth gear - 18.95 mph/l000 rpm - maximum speed 129 mph.
Third gear - 15.64 mph/1000 rpm - maximum speed 106 mph.
Second gear - 11.35 mph/1000 rpm - maximum speed 77 mph.
First gear - 8.31 mph/l000 rpm - maximum speed 57 mph.
At 80 mph in top gear the engine is running at 3600 rpm.
A = 29 TOOTH B = 61 TOOTH
This is the UK engine sprocket with the US rear wheel sprocket to give an overall gear ratio of 3.366.
Top gear - 21.66 mph/l000 rpm giving a theoretical top speed of 147 mph at 6800 rpm.
Fourth gear - 18.36 mph/1000 rpm - maximum speed 125 mph.
Third gear - 15.15 mph/l000 rpm - maximum speed 103 mph.
Second gear - 11.00 mph/l000 rpm - maximum speed 75 mph.
First gear - 8.05 mph/l000 rpm - maximum speed 55 mph.
At 80 mph in top gear the engine is running at 3700 rpm.
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