20 Tooth Sprocket On A Classic Tiger 100S?

[Mapman]

Hi Guys,
I have just purchased a lovely 1969 T100S. Back in the 70s I had one of these but forgot just how high the revs are! At 50 mph I am registering 4000rpm. It has the standard 18t front and 46t rear sprockets. I feel I daren't go any faster at present on such an old lady! I wish to ride a bit faster (60mph) to stay with traffic flow but am certainly not looking to ride this bike hard. Just a bit more relaxed, that's all.
Is it worth me changing the front sprocket to a 20t? What sort of revs will it be at 60mph? Any advice and experiences would be most welcome. Thanks.

 

[Rudie]

worth me changing the front sprocket to a 20t?

Ime, no - the T100S was not intended to be the most powerful version in the range; also all the T100 engines are oversquare - 69 mm bore, 65.5 mm stroke, peak power is developed t something like 7,400 rpm - so they were always intended to be revved more than the 650 and 750 twins.

Ime, 19 tooth front sprocket is worthwhile; having ridden with that, if the rpm is still too high for you, try a standard 43 tooth rear sprocket.