Author Topic: sprocket sizing (Read 18462 times) Tweet

MRBIGZ · « **on:** August 28, 2009, 05:34:43 PM »

I was looking for the answer to my question but I can't find it so I am looking to you guys for some help. Someone told me that if I changed the front sprocket to a 16 tooth it would be the same as going up in the back to a 43 tooth. Basically for every one tooth in the front equals 3 in the rear. Is this true? Does this make any sense to anyone out there? I would also like to ask which is better to do, the front or the rear sprocket in terms of the longevity of the chain? Any comments would be appriciated.

fvance · « **Reply #1 on:** August 28, 2009, 06:01:54 PM »

The 1 to 3 is correct, or very close. I think gearing down is harder on chains. I have a 19/38 setup, the closer you get the sprockets sizes to the same size the more effecient they are.

Cookie · « **Reply #2 on:** August 31, 2009, 05:50:38 PM »

Quote from: MRBIGZ on August 28, 2009, 05:34:43 PM

I was looking for the answer to my question but I can't find it so I am looking to you guys for some help. Someone told me that if I changed the front sprocket to a 16 tooth it would be the same as going up in the back to a 43 tooth. Basically for every one tooth in the front equals 3 in the rear. Is this true? Does this make any sense to anyone out there? I would also like to ask which is better to do, the front or the rear sprocket in terms of the longevity of the chain? Any comments would be appriciated.

16/40 = 2.500
16/41 = 2.563
16/42 = 2.625
16/43 = 2.688
17/40 = 2.353 (Stock GenI)
17/41 = 2.412
17/42 = 2.471
17/43 = 2.529

MRBIGZ · « **Reply #3 on:** August 31, 2009, 06:06:14 PM »

Quote

16/40 = 2.500
16/41 = 2.563
16/42 = 2.625
16/43 = 2.688
17/40 = 2.353 (Stock GenI)
17/41 = 2.412
17/42 = 2.471
17/43 = 2.529

Where did you get this chart from?

FanaticalKilla · « **Reply #4 on:** September 13, 2009, 12:34:02 AM »

Make it yourself all it is, is ratios. Simple formula Driven over drive. Check out gearcommander.com you can input everything and see what happens.

Cookie · « **Reply #5 on:** September 13, 2009, 07:09:29 PM »

Quote from: MRBIGZ on August 31, 2009, 06:06:14 PM

Quote
16/40 = 2.500
16/41 = 2.563
16/42 = 2.625
16/43 = 2.688
17/40 = 2.353 (Stock GenI)
17/41 = 2.412
17/42 = 2.471
17/43 = 2.529

Where did you get this chart from?

Good tip. I got it from a AFAM sprocket computer.

fvance · « **Reply #6 on:** September 13, 2009, 10:12:31 PM »

That chart goes the wrong way!!

Cookie · « **Reply #7 on:** September 14, 2009, 04:16:03 PM »

So do I.

wildphil69 · « **Reply #8 on:** October 07, 2009, 10:04:06 PM »

um no it doesn't??

fvance · « **Reply #9 on:** October 07, 2009, 10:45:46 PM »

Actually I was being kind of a smart ass, as you can see from my signature I run top end only. Sprocket sizes from 18/42 to 19/38. In answer to your question about which is easier on your chain, gearing down is always harder on the chain than up. That said it is probably better to go with a larger rear sprocket.

Fred

busa & 12lover · « **Reply #10 on:** October 16, 2009, 06:40:04 AM »

Cookie · « **Reply #11 on:** October 16, 2009, 12:39:09 PM »

Thank you, Captain Obvious,,, but I will continue using my abacus!

fvance · « **Reply #12 on:** October 16, 2009, 01:32:23 PM »

Everybody I know runs a 19 or 20 on the front.

Fred

Cookie · « **Reply #13 on:** October 16, 2009, 02:12:42 PM »

What sprocket cover are you able to run, Fred? Is there a billet that will accommodate the 20 size?

fvance · « **Reply #14 on:** October 16, 2009, 03:36:06 PM »

Chris, I run a stock sprocket cover and a 19, it is my understanding you can run a 20 no problem. I beleive that the water pump is the limiting factor. Speed King/John Noonan could probably answer better than me on that.

Fred

Cookie · « **Reply #15 on:** October 16, 2009, 11:39:57 PM »

I see. Good stuff, Fred. What do you mean about the water pump? Is it not pumping enough volume? ,, or is the larger sprocket threatening its existence?

And,,, John is one that I would go to. He is and has always a great source of info with loads of expertise.

Cookie · « **Reply #16 on:** October 16, 2009, 11:41:33 PM »

Oh yeah, congrats on that 219.09!

fvance · « **Reply #17 on:** October 17, 2009, 07:58:34 AM »

Thanks Chris. I think anything bigger than a 20 will hit the water pump, its a clearance issue not a functional issue. Still waoting for John to chime in!!

Fred

tat2busa · « **Reply #18 on:** January 30, 2010, 09:32:13 PM »

i run a 17/45 a hole lot of fun

miketurf · « **Reply #19 on:** February 12, 2010, 08:16:08 PM »

Quote from: MRBIGZ on August 28, 2009, 05:34:43 PM

I was looking for the answer to my question but I can't find it so I am looking to you guys for some help. Someone told me that if I changed the front sprocket to a 16 tooth it would be the same as going up in the back to a 43 tooth. Basically for every one tooth in the front equals 3 in the rear. Is this true? Does this make any sense to anyone out there? I would also like to ask which is better to do, the front or the rear sprocket in terms of the longevity of the chain? Any comments would be appriciated.

@ MrBigz it also depends on what u are trying to do with the bike, 16/42 or a 16/43 takes away from your top end speed and makes your low to mid range speed more aggressive, and vice versa 17/40 17/39 18, 19, and 20 will help you on the top end.

mike04busa · « **Reply #20 on:** February 15, 2010, 07:23:40 PM »

Quote from: MRBIGZ on August 28, 2009, 05:34:43 PM

I was looking for the answer to my question but I can't find it so I am looking to you guys for some help. Someone told me that if I changed the front sprocket to a 16 tooth it would be the same as going up in the back to a 43 tooth. Basically for every one tooth in the front equals 3 in the rear. Is this true? Does this make any sense to anyone out there? I would also like to ask which is better to do, the front or the rear sprocket in terms of the longevity of the chain? Any comments would be appriciated.

17/42 is a good street gear if you ride alot and do some commuting with the busa.I'd like to try 16/42 just to see the difference.

miketurf · « **Reply #21 on:** February 15, 2010, 11:25:49 PM »

16/42 is awsome, my buddy has it on his 05 busa, the first gear redlines pretty quick but the bike is fun and more aggressive with that set-up and you can still do everyday riding with no problem.

busaboy18 · « **Reply #22 on:** May 17, 2010, 02:43:49 PM »

i ran a 17/45 forever which made the nose super light even running 90 down the highway... i backed off and went to a 17/43 which i think is perfect!

3cRider · « **Reply #23 on:** May 24, 2010, 09:03:01 PM »

On bigger bikes I've always liked a mild re-gear to the tune of a +2 rear sprocket. It's just enough without making the bike tach-out on the freeway.

speed_pigeon · « **Reply #24 on:** September 02, 2010, 11:19:11 PM »

i really have no answers here, but there is one thing no one touched on.... i see a guy with the name "mrbigz" changing sprokets, i think he's trying to compensate for weight. (not saying he is, but that's where my mind goes) because i know i sure as hell am!! while all you gearing gurus are in one place, what would you do to a stock engine bike's sprokets to allow a 375lb man hold his own on the street and track with you skinny ass 150lb guys? i have no need to do 200 mph. hell, 150 top out would be fine for me for everyday riding!

but just in general, to compensate for A LOT of extra weight and try to improve the life of that poor little chain that has to pull around my fat ass, what would you do?

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Author Topic: sprocket sizing (Read 18462 times) Tweet