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gearing boffins needed

  • Thread starter Thread starter homebrew
  • Start date Start date
H

homebrew

Guest
currently putting a gs750 pre 82 race bike together.ive fitted a 250 bandit rear wheel which i will run a 150/60/17 tyre on.im having to get an offset sprocket for the front but the only one i can find is 530 chain.i can get these in 15 16 and 17 tooth.my question is what size rear would i need to get to near stock gearing.the engine is still totally standard!!!!(spending the money on the chassis first)so i figure stock gearing would be a good starting point.any help would be much appreciated:)
 
There are plenty of websites that can help you do this to match the standard gearing, and any changes that you want to make in the future. Try this one for starters, but there are plenty more to choose from if this one doesn't work for you.

http://www.gearingcommander.com/
 
what size was your original rear tyre, and front and rear sprocket, we can work it out from there.
 
Another 750 in Darfield....Fast Pom has company.

I'm 15 minutes away and build this stuff for Post Classic racing so if you want help or advice just ask.

Myself, I'd go to 520 while I had the chance. More tyre clearance, less sprocket offset required. Our GS1000 is running a 4.5 X17 rear and only required a 4mm spacer behind the front sprocket. Budget in ChCh has the 520 sprockets too. We're running a 41 rear and swap between 15/16/17 fronts depending on circuit.
 
GregT said:
Another 750 in Darfield....Fast Pom has company.

I'm 15 minutes away and build this stuff for Post Classic racing so if you want help or advice just ask.

you may regret that offer :):):)!!! yeah fast pom lives almost next door to me so it should be a bit of humour if we ever get the bikes ready for the track at the same time.ill have to get my tape measure out again and see if i can get away with the spacer(ive currently got a 160 tyre fitted should be 150)so that might not be helping to much.would much rather use 520 chain if possible.cheers for that anyway and i may have to venture down your way with a few cold ones one night:):)
Click to expand...
 
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