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post #1 of 16 (permalink) Old 09-06-2016, 08:49 PM Thread Starter
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Sprocket change

I'm going to be changing my sprockets and chain on my bike soon. It's an 01' 800a. I believe it has the stock sizes. Right now the thing gets it off the lines but is screaming in 5th on the interstate at 75+. I would like to get it to where it still gets it off the line but ain't screaming so much. I don't do much highway riding. I would say my average is 45 mph. Usually don't do much over 70. Maybe I should keep the stock sizes if I want all that get up and go?
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post #2 of 16 (permalink) Old 09-07-2016, 11:21 AM
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I have 18/40 sprockets on my 05 classic, think has the same gearing. I dont ride it hard, so off the line is not a big deal, but I still usually beat most cars through the intersection easily. I also dont normally shift into 5th until I'm doing at least 45-50. I dont think I'll go back to the stock 17/42 sprockets if I can still find a set of 18/40s.

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post #3 of 16 (permalink) Old 09-07-2016, 02:23 PM Thread Starter
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Ya I believe I have the stock 17/42 because I saw 42 engraved onto my rear sprocket last night.
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post #4 of 16 (permalink) Old 09-07-2016, 03:01 PM Thread Starter
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I would like to do the 18/40 but I just don't wanna lose my low end.
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post #5 of 16 (permalink) Old 09-07-2016, 09:55 PM Thread Starter
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Originally Posted by rick View Post
I have 18/40 sprockets on my 05 classic, think has the same gearing. I dont ride it hard, so off the line is not a big deal, but I still usually beat most cars through the intersection easily. I also dont normally shift into 5th until I'm doing at least 45-50. I dont think I'll go back to the stock 17/42 sprockets if I can still find a set of 18/40s.
Just searched all of eBay and could not find any 18/40 combos. Found mainly 17/42 and some 17/40s which would Be a little better then the stock 17/42. My other option would be to keep a 42 rear and just get an 18t front which I can find. That would still be higher geAred then stock but not quite as high 18/40. But then again an 18/42 combo would be equal to a 17/40 setup probably
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post #6 of 16 (permalink) Old 09-08-2016, 07:22 AM
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i recommend that you do not go to a 18 tooth front , leave your front 17T, because you said that you don't want to lose your low end, and what will happen if you remove the 17 front and go 18 is you will lose 3 teeth on the rear, let me explain, a 1 tooth increase on the front is equal to a 3 teeth drop on the rear, so a 18/42 would be equal to a 17/39, and with a 39 rear you will definitely lose low end, so with a 18/42 you will lose the same low end as an 17/39, now if you go 18/40, you will basically have no low end whatsoever, because going from a 42 rear to a 40 rear you will lose 2 low end teeth and combined with the 3 teeth loss going from a 17 to 18 front, 2+3= you will lose 5 teeth torque on the low end, that's the same as keeping the from 17 and going to a 37 rear (18/40 = 17/37) so just go over these numbers before you do anything just to make sure that you are aware that with a 18/40 you will have no low end at all, sure great on the highway in 5th gear but you can kiss your low end torque good-bye, I recommend that if you want to change sprockets consider keeping the front 17 and go with a 40 rear but no lower, go 17/40 and keep the front stock, it's very difficult to remove and replace the front anyways

Thunder Mfg teardrop 40's K&N 170MJ 48PJ 2.75turns DynoJet Needle DNO106 2nd notch V&H Cruzers Aeromach risers Michelin Commander IIs Wix 51358 filter 17T/40 Sprockets, 2357 rear bulbs
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post #7 of 16 (permalink) Old 09-08-2016, 07:24 AM
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you say a 18/42 combo would be equal to a 17/40 but actually a 18/42 is = a 17/39

Thunder Mfg teardrop 40's K&N 170MJ 48PJ 2.75turns DynoJet Needle DNO106 2nd notch V&H Cruzers Aeromach risers Michelin Commander IIs Wix 51358 filter 17T/40 Sprockets, 2357 rear bulbs
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post #8 of 16 (permalink) Old 09-08-2016, 05:28 PM Thread Starter
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So do you think a 17/40 combo would be my happy medium? Will I lose that much down low? Will I even gain that much on the highway? Only if they made these bikes 6 speeds lol
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post #9 of 16 (permalink) Old 09-08-2016, 05:49 PM
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17/40 is what i have, I find it a happy medium between 1st gear get go and 5th gear 70 mph highway, down low is good, you won't lose a lot down low, on the highway the 40 tooth rear will increase your mpg and lower the rpm's a bit, what i would do is play with the rear sprocket ratio and leave the front the 17 stock, you could even try a 39 rear and go 17/39, that would be better then going to a 18/40 which is equal to a 17/37

Thunder Mfg teardrop 40's K&N 170MJ 48PJ 2.75turns DynoJet Needle DNO106 2nd notch V&H Cruzers Aeromach risers Michelin Commander IIs Wix 51358 filter 17T/40 Sprockets, 2357 rear bulbs
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post #10 of 16 (permalink) Old 09-08-2016, 05:54 PM
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play around with this sprocket calculator

Sprocket Calculator - the easy motorcycle sprocket and chain calculator

Thunder Mfg teardrop 40's K&N 170MJ 48PJ 2.75turns DynoJet Needle DNO106 2nd notch V&H Cruzers Aeromach risers Michelin Commander IIs Wix 51358 filter 17T/40 Sprockets, 2357 rear bulbs
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