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24-04-2018, 12:18 PM | #1 |
Bronze Member
Join Date: Jul 2006
Location: Poole
Bike: M900ie
Posts: 472
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Gearing S2R 1000+
Hi all,
I'm just trying to decide on what size rear sprocket to use on the latest stage of my 1994 bike now fitted with an overbored S2R lump, HC pistons, vee-two cams etc, but std valves. now I do tend to go for over-gearing rather than under so my thinking is to use a 39 tooth sprocket or maybe 38. I was also planning on fitting 120/70 front and 180/55 rear (in part for the electronic speedo accuracy issues). Top speed isn't really a priority, bur mid range "Go" is. Has anybody got experience to share? Cheers Bitza.
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Bitza |
24-04-2018, 01:21 PM | #2 |
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Join Date: Jul 2003
Location: East London
Bike: Multiple Monsters
Posts: 9,715
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My stock roadgoing 1000 (not S2R but damn similar) runs 15/42 (less strain on chain than 14t front)and tops out at about 135 (well known German toll road.
My 1078hc, big valves, pure-tech sports cams, gas flow, lightened everything: runs stock 15/39. It tries to hoist the front wheel changing into 4th at ~110 and gearing commander said it was doing 143 at 8k in top before getting on the brakes down the back straight at Aragon. HTIOH |
24-04-2018, 03:54 PM | #3 |
Bronze Member
Join Date: Jul 2006
Location: Poole
Bike: M900ie
Posts: 472
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Thanks for that insight "Slob", keeping the front wheel down near the road does seem to be the pay back for so much torque. I should have said that I'm using a 15 tooth gearbox sprocket too. Bitza.
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Bitza |
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