Brian foord Posted February 21, 2018 Posted February 21, 2018 I am building a katana 1100 with a 17”rear wheel out of a GSXR 1000. I have a offset 18tooth front sprocket fitted for a 530 chain. What would be the best tooth size to go for on the rear sprocket? Thanks Quote
eightball_hotrod Posted February 21, 2018 Posted February 21, 2018 check this : http://www.gearingcommander.com/ Quote
no class Posted February 21, 2018 Posted February 21, 2018 You staying stock ratio or going shorter ? Stock is 15/42 = .357......18/49 =.367....... 18/50 = .360 .......18/51= .346............Higher the number means more revs/grunt..... lower ..... well..... means taller Quote
dupersunc Posted February 22, 2018 Posted February 22, 2018 11 hours ago, no class said: You staying stock ratio or going shorter ? Stock is 15/42 = .357......18/49 =.367....... 18/50 = .360 .......18/51= .346............Higher the number means more revs/grunt..... lower ..... well..... means ta0ller Other way round. Quote
Dezza Posted February 22, 2018 Posted February 22, 2018 Unless your bike has undergone dramatic weight loss and or power increase, going up 3 teeth on the front will be too much without also going up a lot on the back. If the stock gearing is 15/42 then the gearbox sprocket has to turn 2.8 times to make the rear wheel turn once. The GSXR rear wheel will help as it is a lower profile tyre than a stock Kat rear but anything less than 2.5 and you may be overgeared. A 45 tooth rear sprocket would give you this ratio; to get the stock ratio of 2.8 you'll need a 50 tooth sprocket but using one this big may mean you run into chain fouling issues, e.g. on the rear shock. Personally, I would use a 16 or a 17 tooth front sprocket but as we all know, these aren't exactly cheap. Quote
no class Posted February 22, 2018 Posted February 22, 2018 3 hours ago, dupersunc said: Other way round. I don't follow Dup...... in my book taller gearing = top end. ....... shorter gearing = grunt ......so going larger front with stock rear will give taller gearing....... smaller front stock rear gives shorter gearing Quote
dupersunc Posted February 22, 2018 Posted February 22, 2018 (edited) 44 minutes ago, no class said: I don't follow Dup...... in my book taller gearing = top end. ....... shorter gearing = grunt ......so going larger front with stock rear will give taller gearing....... smaller front stock rear gives shorter gearing Agreed. Your first post didn't read like that to me. Maybe it was just me. Edited February 22, 2018 by dupersunc 1 Quote
gsx Posted February 22, 2018 Posted February 22, 2018 18 /48 with 530 conversion and 17 s , as said above ,gearing commander is your friend Quote
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