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Discussion in 'Thumpers' started by Loadedagain, Apr 22, 2005.
Any luck Loaded - peeped on yr WS but not readily there.
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
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.
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!
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.
That was very helpful indeed. Thanks! From what it shows the difference from 16/42 to 17/45 is very small. So looks like that may be a good option for me to try out.
Yup... super old thread, but I thought I'd share my findings on the topic.
I have a 1999 Enduro, and wanted two sets of gearing - one ratio similar to stock, and one that got me cruising faster at lower RPM's. Also, I wanted the largest spread I could get [within reason] without changing the chain.
So, I crunched the numbers, and I've been running this setup for a little over a year now.
16/38 - 1.58% higher RPM's than stock [@ 60mph]
15/40 - 9.52% lower RPM's than stock [@ 60mph]
This necessitates a shorter chain than stock [108 links, I think].
This works great for how I use the bike lately [supermoto wheels around town and on the twisties (15/40) / stock wheels with knobbies for trips to the OHV park (16/38)].
If stock is 16/42, and you're talking about stock 18" rear, 21" front wheels, your RPMs should decrease with 16/38, not increase. Or are you basing off something other than 16/42?
Anybody got a copy of Loaded's gearing calculator they can PM me? Thanks.
I know this is an old thread but I was hoping someone could help me with something.
Do I need to look for a specific type or oem CS sprocket or can I purchase anything that fits like the RS sprocket??
I am looking for a pair of wide ratio 5th gears that was used in a 1995 duke. The part # of the 27 tooth mainshaft gear is 533 33 008 006 and the # for the 21 tooth countershaft gear is 583 33 011 007. KTM in Ohio is out of them, and I was hoping that perhaps someone somewhere might have them sitting on a shelf. I would even be interested a good used set. Thank you all.
I'm assuming you checked other online vendors such as Munn Racing?
I have not checked them yet but I will.