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Old 04-03-2007, 09:36 AM   #91
magli
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Conclusion?

Hey Loaded, did you ever put that 38 on? What was the result?

Now that it has been a while, and you have had time to test the various sizes out, what is the conclusion? Would love to here your take on the various ratios... I am looking for a second gear ratio for highway cruising, when I want to go long distance... is 17-38 too radical?


Cheers.
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Old 04-03-2007, 11:17 AM   #92
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Quote:
Originally Posted by magli
Hey Loaded, did you ever put that 38 on? What was the result?

Now that it has been a while, and you have had time to test the various sizes out, what is the conclusion? Would love to here your take on the various ratios... I am looking for a second gear ratio for highway cruising, when I want to go long distance... is 17-38 too radical?


Cheers.
I'm not Loaded, but maybe I can provide some info:

I ran 17/38 on my '02 640 Adv with a set of motard wheels. Even with the much smaller diameter 17" rear, 17/38 was just about too tall. It really takes a lot of snap out of the performance, and makes uphill twisties a strain. You really have to wring its neck.

The math says 17/42 with the 18" rear (140/80-18) would be comparable to 17/38 with the 17" rear (150/60-17). In my experience, I wouldn't go any taller than that, but I haven't actually tried 17/42 yet.
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Old 04-03-2007, 11:32 AM   #93
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17/42

See post #9, etc.
PS, Holy ancient thread revival!
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Old 04-03-2007, 11:51 AM   #94
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Quote:
Originally Posted by Arch
See post #9, etc.
PS, Holy ancient thread revival!
Yeah, it's an oldy-goldy.

I think magli deserves a pat on the back for finding it instead of starting a new thread.
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Old 04-03-2007, 11:54 AM   #95
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Originally Posted by Stobie
Yeah, it's an oldy-goldy. I think magli deserves a pat on the back for finding it instead of starting a new thread.
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Old 04-04-2007, 02:49 AM   #96
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Quote:
Originally Posted by Arch
Quote:
Yeah, it's an oldy-goldy. I think magli deserves a pat on the back for finding it instead of starting a new thread.
Hehe... cheers.

So, since I do not mind losing performance, as this would really only be a setup for covering long distance, I think that the 17-40 ratio which arch suggests in post 9 seems like a good idea, since it allows for the same chain size.

So, the only question that leaves, before I go and order these parts, is whether it is a bad idea to use the same chain: I was always told that the chain and sprockets should be changed at the same time, etc... would I skrew up my chain if I occasionally changed the sprockets?

Thanks for the replies,
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Old 04-04-2007, 05:23 AM   #97
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I've never worried about that on dirtbikes, where chains & sprockets are relatively (compared to easy street miles) short lived anyway.
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Old 09-15-2009, 08:10 AM   #98
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Anyone have a copy of that handy LC4 specific spreadsheet?
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Old 09-15-2009, 08:37 PM   #99
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Originally Posted by Bo_9
Anyone have a copy of that handy LC4 specific spreadsheet?
Yes, PM me your email address and I will send it along. That will be my penalty for not uploading this stuff to one of two nice people who have offered space on their servers...
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Old 09-16-2009, 12:07 AM   #100
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i swear i uploaded the spreadsheet i made to my own web site... i'm sure it's in there some place... just where... shit... i''ll look tomorrow.
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Old 09-26-2009, 08:24 AM   #101
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Any luck Loaded - peeped on yr WS but not readily there.
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Old 09-26-2009, 10:15 AM   #102
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KTM 640 gear ratios

gear__Primary ___ Final __ first__ second __ third __ fourth ___ fifth
ratio__ 2.55_____ 2.63 __ 2.50 __ 1.60 ___ 1.17 ____ 0.95 ____ 0.82
teeth__79/31 ___ 42/16 _ 35/14 _ 24/15 __ 21/18 ___ 19/20 ___ 18/22
overall ________________ 16.72 __ 10.70 __ 7.80 ___ 6.36 ____ 5.47

See five speed vs. six speed, some surprises
http://www.advrider.com/forums/showt...=281742&page=9
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Old 10-21-2009, 12:00 AM   #103
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New rear sprocket

My 640 was geared way to low for what I was doing. I ordered a custom rear sprocket from Krause Racing 37 tooth, I can now run down the hwy when I need to and do 65 at 5000 rpm. I have a 17 in front, this is the highest gearing I could find anywhere. OK not for everyone but it works for me!
Watch the chain backlash on the swing arm, it will cut it on top behind the chain slider.
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Old 03-28-2011, 06:20 PM   #104
bikepikespeak.com
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17-45?

I'm trying to see if anyone has run this combo at all? I can't find anywhere that someone has so far. I have an 06 (comes stock w/ 16-42) Gearing seems pretty good all around. I think I WOULD like maybe a touch lower for my offroad stuff, but don't want to sacrifice TOO much of the hwy stuff. I was thinking that maybe this combo would do that for me? I don't understand much at all about gear ratio's...so all those numbers in the other posts don't mean anything to me. Too bad this can't be like riding a bike. You just push a trigger and get into the gear you want! hhaha.
Thanks for any input!
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Old 03-29-2011, 06:02 AM   #105
JensEskildsen
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www.gearingcommander.com

Type in your bike, model, year and so on, and you can play with different sprockets, to see what rpm at what speeds that gives you.

VERY helpfull tool.
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