I wouldn't worry about it, if you are trying to do wheelies and have quicker acceleration....You'll still be able to do illegal speeds on the street with it...
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danieljardim
New Member
By the way... I'm wondering if ever got the bike :rof:
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Parcho
New Member
You can definatley expect to lose some top speed. The girl in the linked video will explain it more clearly than I can.
[ame=http://www.youtube.com/watch?v=Qhm7-LEBznk]The real meaning of MPH- The Original - YouTube[/ame]
I've also attached some examples that would go along with the video.
compared to this wheel diameter.
[ame=http://www.youtube.com/watch?v=Qhm7-LEBznk]The real meaning of MPH- The Original - YouTube[/ame]
I've also attached some examples that would go along with the video.
compared to this wheel diameter.
BStar, I think what my fellow forum members are trying to say, is that if you do as you're suggesting, you'll render the bike nearly useless. I'd recommend going -1, +2 first and see how you like that. Should give you a lot more acceleration, but you should still be able to drive the speed limit on a freeway without running at five digit RPMs. If that doesn't cut it for you, you should probably get a bike with more torque.
At -2, +3, I'd guess your top speed to be maybe 85mph? You might be able to hit 100, but that'd be about it. Of course that's in real speed. With that gearing, your speedo would say you were doing ~150.
UselessPickles
New Member
-2/+3 sounds quite excessive. I think I'll run that through my simulation tonight to see just how ridiculous it is. That's about a 22% change in gearing (22% more wheel torque at any given engine speed, but at a 22% lower road speed). You'll probably have no problem doing wheelies around 20-35mph in 1st gear, but you'll have to shift to 2nd around 40mph. From there on out, you won't really have improved acceleration (explanation here), but you'll be up-shifting more often, then cruising at higher RPMs.
I think you'll end up bouncing off the rev limiter in 6th gear right around 107mph. 6th gear will be almost like a stock bike's 4th gear. Go ride around without ever shifting above 4th gear, and that'll give you an idea what it would be like cruising around with -2/+3 sprockets.
I think you'll end up bouncing off the rev limiter in 6th gear right around 107mph. 6th gear will be almost like a stock bike's 4th gear. Go ride around without ever shifting above 4th gear, and that'll give you an idea what it would be like cruising around with -2/+3 sprockets.
I guessed top speed at around 100mph. Not bad for a non educated guess.
UselessPickles
New Member
I haven't actually worked out the results yet. I may have done something backwards with the ratios to come up with the 22% difference. I'll post real results later.
Try this website: Gearing Commander: Motorcycle Speed, RPM, Chain & Sprockets Calculator
It will show you the correct #'s for what ever configuration you choose.
It will show you the correct #'s for what ever configuration you choose.
Give and take... your new top gear (6th) will be very close to the stock 4th. So ride in 4th gear on freeway and see how you like it.
8K = 72 MPH
I can't explain it, but world champion drag racer Rickey Gadson did a FASTER quarter mile on the ZX-14R with HIGHER than stock gearing. He ran a 9.64 with stock gearing, and a 9.31 with the higher gearing. From March Cycle World.
So if you're looking for faster acceleration, you might want to think twice about the extreme sprocket swap.
So if you're looking for faster acceleration, you might want to think twice about the extreme sprocket swap.
Chevyfazer
New Member
Are you planing on using this bike for stunting only? Because with this setup it would be pretty much useless for anything but stunting or maybe the 1/8mile strip.
On the zx14 that could have been from numerous things, I'd be willing to bet that by going up on the gears with it allowed for better launch and one less shift on the 1/4 which will save time, but on 90% of other bikes going down a little not a lot will help it accel a bit faster
hahaha i live with bstar if he would listen i told him 90% of what you guys are saying i guess i need to beat him with a news paper
UselessPickles
New Member
Results are in...
Assuming a 170lb rider, shifting optimally for acceleration, 0.32s per shift...
Test: [stock result] -> [-2/+3 result]
0-60mph (8k rpm launch): 3.75s -> 3.78s
0-100mph (8k rpm launch): 10.89s -> 10.72s
1/4 mile (8k rpm launch): [email protected] -> [email protected]
0-60mph (4k rpm launch): 4.26s -> 3.92s
0-100mph (4k rpm launch): 11.39s -> 10.86s
1/4 mile (4k rpm launch): [email protected] -> [email protected]
(accelerating up to freeway speed from an entrance ramp)
40-80mph: 4.13s -> 4.25s
(passing a slow car on a country road)
45-60mph: 1.23s -> 1.47s
Top speed: 124mph -> 113mph
RPM @ 70mph in 6th gear: 5832 -> 7100
Indicated speed at 70mph: ~74mph -> ~90mph
Conclusion: Yes, -2/+3 sprockets will make you accelerate quicker than stock if starting from 0mph (or other very low speed) and launching at lower RPMs. But it has no advantage over stock when actually trying to launch quickly, or when accelerating from a rolling start at a higher speed.
Assuming a 170lb rider, shifting optimally for acceleration, 0.32s per shift...
Test: [stock result] -> [-2/+3 result]
0-60mph (8k rpm launch): 3.75s -> 3.78s
0-100mph (8k rpm launch): 10.89s -> 10.72s
1/4 mile (8k rpm launch): [email protected] -> [email protected]
0-60mph (4k rpm launch): 4.26s -> 3.92s
0-100mph (4k rpm launch): 11.39s -> 10.86s
1/4 mile (4k rpm launch): [email protected] -> [email protected]
(accelerating up to freeway speed from an entrance ramp)
40-80mph: 4.13s -> 4.25s
(passing a slow car on a country road)
45-60mph: 1.23s -> 1.47s
Top speed: 124mph -> 113mph
RPM @ 70mph in 6th gear: 5832 -> 7100
Indicated speed at 70mph: ~74mph -> ~90mph
Conclusion: Yes, -2/+3 sprockets will make you accelerate quicker than stock if starting from 0mph (or other very low speed) and launching at lower RPMs. But it has no advantage over stock when actually trying to launch quickly, or when accelerating from a rolling start at a higher speed.
lol not that kind of relationship he is my brother
So he's not heavy?