42 tooth rear sprocket - Honda Motorcycles - FireBlades.org
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post #1 of 15 Old 11-04-2009, 9:31 PM Thread Starter
 
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42 tooth rear sprocket

I have a 00' 929 with stock gearing 16/43...I'm due for a chain soon and I found a good deal on a 42 tooth sprocket but I have not been able to find too much info on going -1 tooth in the back. Am I going to accelerate slower? I also heard that the speedos on 929's are slightly off...will this fix the problem?
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post #2 of 15 Old 11-04-2009, 9:47 PM
 
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Re: 42 tooth rear sprocket

Speedo Healer to correct and calibrate the speedo..
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post #3 of 15 Old 11-04-2009, 10:03 PM
 
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Re: 42 tooth rear sprocket

you dont want to go smaller in the back, try this -1 in the front and +2 in the rear your bike will be a whole new beast
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post #4 of 15 Old 11-04-2009, 10:54 PM
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Re: 42 tooth rear sprocket

16/42 is standard for everybody outside the US so it's not a big deal.
I definately recommend dropping a tooth off the front though.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #5 of 15 Old 11-05-2009, 5:07 AM
 
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Re: 42 tooth rear sprocket

HI GUYS QUICK QUESTION I HAVE A 2004 CBR1000RR WHICH I HAVE FIXED UP TO BE A TRACK BIKE. I CLOSE TO NEEDING A NEW CHAIN AND AS I HAVE READ AROUND WHEN YOU NEED A CHAIN YOU SHOULD CHANGE SPROCKETS AS WELL SO I WILL GET IT ALL>

NOW THE QUESTION IS? OEM SPROCKETS IS A 16 FRONT AND 40 REAR. I WAS THINKING IS GOING -1 DOWN ON THE FRONT AND +1 ON THE REAR BUT IM NOT SURE WHAT IT WILL DO? IM NOT SURE HOW THE BIKE WILL RIDE WITH A CHANGE?
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post #6 of 15 Old 11-05-2009, 5:32 AM
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Re: 42 tooth rear sprocket

Quote:
Originally Posted by SLIMA View Post
HI GUYS QUICK QUESTION I HAVE A 2004 CBR1000RR WHICH I HAVE FIXED UP TO BE A TRACK BIKE. I CLOSE TO NEEDING A NEW CHAIN AND AS I HAVE READ AROUND WHEN YOU NEED A CHAIN YOU SHOULD CHANGE SPROCKETS AS WELL SO I WILL GET IT ALL>

NOW THE QUESTION IS? OEM SPROCKETS IS A 16 FRONT AND 40 REAR. I WAS THINKING IS GOING -1 DOWN ON THE FRONT AND +1 ON THE REAR BUT IM NOT SURE WHAT IT WILL DO? IM NOT SURE HOW THE BIKE WILL RIDE WITH A CHANGE?
The CapsLock key is to the left...
If it's a track bike then you need to choose your gearing to suit the circuits you ride at.
How close are you getting to redline in top gear now?

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #7 of 15 Old 11-05-2009, 9:09 AM
 
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Re: 42 tooth rear sprocket

Quote:
The CapsLock key is to the left...


Not sure about the 1,000 but the 929 is great fun at +1r/-1f which increase accelaration, reduces top speed. I would not go -1 on the rear though, you'll go faster (potentially) but reduce the accelaration which is one of the best bits!!
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post #8 of 15 Old 11-05-2009, 12:14 PM
 
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Re: 42 tooth rear sprocket

Quote:
Originally Posted by SLIMA View Post
HI GUYS QUICK QUESTION I HAVE A 2004 CBR1000RR WHICH I HAVE FIXED UP TO BE A TRACK BIKE. I CLOSE TO NEEDING A NEW CHAIN AND AS I HAVE READ AROUND WHEN YOU NEED A CHAIN YOU SHOULD CHANGE SPROCKETS AS WELL SO I WILL GET IT ALL>

NOW THE QUESTION IS? OEM SPROCKETS IS A 16 FRONT AND 40 REAR. I WAS THINKING IS GOING -1 DOWN ON THE FRONT AND +1 ON THE REAR BUT IM NOT SURE WHAT IT WILL DO? IM NOT SURE HOW THE BIKE WILL RIDE WITH A CHANGE?
lol

-1 front and +1 rear will give you better acceleration and you will lose a little top end.


--For the OP with the 929, its personal preference as far as changing the gearing. I personally am going -2 front and +3 rear (14/46) but that is a big difference from stock that will add a lot of acceleration and cost me at top end.

Last edited by afchicrider; 11-06-2009 at 1:32 PM.
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post #9 of 15 Old 11-05-2009, 10:05 PM
 
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Re: 42 tooth rear sprocket

you cant get -2 on the front in a 530 pitch can you ???
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post #10 of 15 Old 11-05-2009, 11:58 PM
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Re: 42 tooth rear sprocket

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you cant get -2 on the front in a 530 pitch can you ???
Sure you can.
Try SPROCKET SPECIALISTS-Sprockets for all makes of bikes.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #11 of 15 Old 11-06-2009, 3:29 AM
 
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Re: 42 tooth rear sprocket

thanks for that bladeracer!!
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post #12 of 15 Old 11-06-2009, 6:45 AM
 
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Re: 42 tooth rear sprocket

thanks bladeracer i always get told but capslock!

since fixing up the bike have done winton, broadford and phillip island in VIC once each

at winton & broadford i dont get above 4th gear both tracks are more technical

but at the island getting into 6th but half way down the stright but i dont feel like im getting anywhere close to top speed before running out of stright road very quickly


so lets say i do 280km down the stright at the island with 16F/40R
but i change it to 15F/41R how much would i be looking dropping off 280km?
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post #13 of 15 Old 11-06-2009, 7:31 AM
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Re: 42 tooth rear sprocket

Quote:
Originally Posted by SLIMA View Post
thanks bladeracer i always get told but capslock!

since fixing up the bike have done winton, broadford and phillip island in VIC once each

at winton & broadford i dont get above 4th gear both tracks are more technical

but at the island getting into 6th but half way down the stright but i dont feel like im getting anywhere close to top speed before running out of stright road very quickly


so lets say i do 280km down the stright at the island with 16F/40R
but i change it to 15F/41R how much would i be looking dropping off 280km?
I haven't ridden Winton but I want to one day :-)
You will want much lower gearing for there and Broadford (haven't ridden Broadford since '92 though). On the 929 I run 15/47 (stock is 16/42) here for Wanneroo which tops out around 250kph. I usually just wind fourth out to redline at Collie which tops out just on 200kph.
I've only done The Island on my GSXR750 but I was running 14/46 from memory (stock is 16/43 I think) for about 255kph.
I don't have transmission ratios handy for the 1000RR so I can't tell you. How close to redline are you pulling top gear currently?
I'd expect taking a tooth off the front would probably drop your top speed by about 20kph _at redline_ or about 1000RPM. If you're already pulling to redline then there's nothing to be gained by lowering your gearing.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #14 of 15 Old 11-07-2009, 5:08 PM
 
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Re: 42 tooth rear sprocket

thanks bladeracer for an idea

i will do the change im sure that broadford and winton will not worry me with the change but i will done the island next and will see what happens
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post #15 of 15 Old 11-07-2009, 5:40 PM
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Re: 42 tooth rear sprocket

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Originally Posted by SLIMA View Post
thanks bladeracer for an idea

i will do the change im sure that broadford and winton will not worry me with the change but i will done the island next and will see what happens
Gearing down allows you to use just the closer top ratios and avoid having to use first and second - and the neutral between them - so it can be useful to gear way down.

As I said, I use wanneroo gearing at Collie and just use first to fourth but next season I want to gear it down to pull top gear and avoid first - probably 14/51 or 52 which will need an extra two chain links.
Should still let me pull over 200kph on the straight.
I use a spreadsheet and note the gear and maximum and minimum RPM at each turn and ends of the straights. Then I juggle the gearing to make the most efficient use of the gearbox so you're staying in the bottom of the power at the slowest point of the turns and peaking a gear at the ends of the straights.

At Wanneroo for example with stock gearing you don't even hit fifth gear on the 929. Running 15/47 (-1/+5) allows third gear through turns one and seven and runs fourth gear from the exit of one right through to the exit of turn six and just uses fifth and sixth gears on the main straight. I don't need first or second and only make seven shifts per lap. I can also run third through turns four (the left hander) and six (the Basin) if I want to which makes for eleven shifts. There is still a little room left in top gear but gearing down further to 15/48 means I need to grab fifth on the front and back straights just for a few meters and adds four shifts for zero benefit. Gearing up to 15/46 tends to drop off the bottom of the power in turns one and seven if I get stuck behind somebody.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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