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+--- Thread: 45t rear sprocket. (/showthread.php?tid=14185)
45t rear sprocket. - [UNIT] - 02-01-2010
Hi
my bikes off the road getting work done and I'm thinking of throwing a 45t rear sprocket on.
How much of a difference can be felt going +2 on the rear?
Also what's the easiest way to correct the speedo?
Cheers!
RE: 45t rear sprocket. - Resn8 - 02-01-2010
I just put a 46t rear and wow baby, Bgw are doing Vortex rears for $70 delivered....You cant go wrong.
RE: 45t rear sprocket. - bigjay - 02-01-2010
If ya like wheelies, then yeah................
RE: 45t rear sprocket. - Resn8 - 02-01-2010
Wheelies depend on how much you weigh! me being 125+kg's not so many wheelies!
RE: 45t rear sprocket. - [UNIT] - 02-01-2010
I'm 115kg and 6ft6. Still manage to wheelie way too much!
I'll go 46 if it fits with STD length chain!
I'm worried about calibrating my speedo tho!
RE: 45t rear sprocket. - Resn8 - 02-01-2010
Like i said i'm 125+ and 6ft1, and i manage to keep the front down just fine with a 46t, it will fit with the std chain and at 110k's on the speedo is about 100k's for real, so it reads 9 - 10 k's fast.
RE: 45t rear sprocket. - bigjay - 02-01-2010
i had 18/44 and it was wheelie happy. Going 46 with standard chain will shorten wheelbase and make it wheelie more
RE: 45t rear sprocket. - Resn8 - 02-01-2010
Im wheelie happy with mine as well!
RE: 45t rear sprocket. - Holeshot - 06-01-2010
Hi
We took our K8 to heathcote with a extra link in the chain and a 45T r/spk. 1st 2 runs 9.88 & 9.87 / 146 mph and change. Went to a 43T [had to take extra link out] straight to 9.62/148.22, one less gearchange and a lot easy to get off the line , tried a 42T next, best leave [1.59 60 ft] and ET 9.56/147.8 but lost a little speed. I guess what I`am trying to say is lowering the gearing is good for wheelies [but you already new that] and feels like its accelerating harder but sometimes its not. I am not trying to be a smartarse just some observations and a lot of runs down the 1/4 mile over the years. Jim
RE: 45t rear sprocket. - larra - 07-01-2010
(06-01-2010, 11:48pm)Holeshot Wrote: Hi
We took our K8 to heathcote with a extra link in the chain and a 45T r/spk. 1st 2 runs 9.88 & 9.87 / 146 mph and change. Went to a 43T [had to take extra link out] straight to 9.62/148.22, one less gearchange and a lot easy to get off the line , tried a 42T next, best leave [1.59 60 ft] and ET 9.56/147.8 but lost a little speed. I guess what I`am trying to say is lowering the gearing is good for wheelies [but you already new that] and feels like its accelerating harder but sometimes its not. I am not trying to be a smartarse just some observations and a lot of runs down the 1/4 mile over the years. Jim
What 60 ft time you got 45t and 43 t? ,1/8 ?, is the wheelbase stock lenght?
RE: 45t rear sprocket. - Holeshot - 07-01-2010
Std K8 Busa with RS3 yoshi cans, lowered, stock length, but exta link with 45T r/spk, reverse pattern gearchange + quickshifter, + TRE and PC3. Dynoed at 175 rwhp @ 105 Ft/ibs torque on our dynojet dyno.
With 45T best 60ft 1.66 and 6.49/115.15 mph at 660ft. 43T= 1.65/60ft 6.31/118.64 and 42T= 1.59/60ft 6.23/117.89. Obviously some of the improvement is getting used to riding again [we dont actually have a dragstrip in SA] cheers Jim
RE: 45t rear sprocket. - bigjay - 08-01-2010
(07-01-2010, 08:28pm)Holeshot Wrote: Std K8 Busa with RS3 yoshi cans, lowered, stock length, but exta link with 45T r/spk, reverse pattern gearchange + quickshifter, + TRE and PC3. Dynoed at 175 rwhp @ 105 Ft/ibs torque on our dynojet dyno.
With 45T best 60ft 1.66 and 6.49/115.15 mph at 660ft. 43T= 1.65/60ft 6.31/118.64 and 42T= 1.59/60ft 6.23/117.89. Obviously some of the improvement is getting used to riding again [we dont actually have a dragstrip in SA] cheers Jim
I'm not surprised that going to a 42 rear made the bike quicker. I was told to do that on more than 1 occasion and also from a KNOWN racer in the states too.....