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03-08-2011, 07:40 PM   #34966
mgorman
Crashing since 1964

Joined: Oct 2006
Location: Massillon, Ohio
Oddometer: 5,256
Quote:
 Originally Posted by swingset I found a good resource on chain wear after I asked. I guess the issue is that mathematically it puts the same link in the same tooth every few turns, whereas even/odd spreads out the contact. Issue? Theoretically it would wear some teeth/links worse than others and shorten the life. Reality seems to suggest unless you're running a chain oiler and getting 50k out of your chains you won't see the difference. Anyway, I like to be a rolling experiment....it's science and shit!
Look at an even number front sprocket, the inner plates wear the same teeth and every other tooth is missed by the outer plates. I think if you had odd number teeth on both sprockets, then each tooth would alternate between inner and outer plates.

Seems to me for that particular roller to hit that same tooth on a regular basis, the number of rollers on the chain would have to be divisible by the number of teeth on the sprocket and the result be a whole number, otherwise, that tooth would hit a different roller next time up to bat.

I think that makes sense or I'm comparing your chain to the contact patch of the jeans posted above...
__________________
Michael

AES Racing - Crow Canyon Riding Park

03-08-2011, 07:44 PM   #34967
Whitey1

Joined: Mar 2008
Location: Marion, Ohio
Oddometer: 10,204
Quote:
 Originally Posted by mgorman Nicest 950/990 saddle I've seen in quite some time
Wow, I guess I have put on some weight since that photo was taken. Sorry bout the plummers crack.

 03-08-2011, 07:48 PM #34968 mgorman Crashing since 1964     Joined: Oct 2006 Location: Massillon, Ohio Oddometer: 5,256 Cut and dyed your hair too! __________________ Michael AES Racing - Crow Canyon Riding Park
03-08-2011, 07:54 PM   #34969
swingset
Got the knack.

Joined: Mar 2008
Location: Central Ohio
Oddometer: 10,924
Quote:
 Originally Posted by mgorman Look at an even number front sprocket, the inner plates wear the same teeth and every other tooth is missed by the outer plates. I think if you had odd number teeth on both sprockets, then each tooth would alternate between inner and outer plates. Seems to me for that particular roller to hit that same tooth on a regular basis, the number of rollers on the chain would have to be divisible by the number of teeth on the sprocket and the result be a whole number, otherwise, that tooth would hit a different roller next time up to bat.
Yeah, something like that I can't stop thinking about asses now....so math is like, unpossible.

03-08-2011, 08:19 PM   #34970
mgorman
Crashing since 1964

Joined: Oct 2006
Location: Massillon, Ohio
Oddometer: 5,256
Quote:
 Originally Posted by swingset Yeah, something like that I can't stop thinking about asses now....so math is like, unpossible.

Geared...

Missing some gear...

__________________
Michael

AES Racing - Crow Canyon Riding Park

03-08-2011, 09:05 PM   #34971
MeefZah
Curmudgeonly

Joined: Nov 2003
Oddometer: 10,993
Quote:
 Originally Posted by invisible monster Looks like she is wearing knee pads.
__________________
"A man turns his back on the comforts of home, and when the dust all settles and the story is told, history is made by the side of the road..." - DBT

03-08-2011, 10:08 PM   #34972
Whitey1

Joined: Mar 2008
Location: Marion, Ohio
Oddometer: 10,204
Quote:
 Originally Posted by MeefZah

So she is pro ATGATT but forgot to cover her ATcrack.

03-08-2011, 10:45 PM   #34973
jitterymonkey

Joined: Nov 2010
Location: Canton Ohio
Oddometer: 406
Quote:
 Originally Posted by swingset Damn, I've been busy! Speaking of upgrades, anyone know about gearing issues - specifically the downsides of a 16/42 combo? They sent me a 42 tooth rear instead of a 41, it fits fine I rode it today and I like the change, but I've heard even/even is hard on the chain & sprockets...but I'm not sure if that's really true or more of a wive's tale. Anyone know?
Quote:
 Originally Posted by miketv Please don't believe everything you read in the internet. even/even? WHHHAT? Who the fuck cares.... DUUUUUUDE, chill out, ride and relax... (I'm sure an interweb expert will be along shortly to chastise)
Hmmm. Not sure if it's true or not, but it's something to think about.
The right gearing is very important & new sprocket/chain sets ain't cheap.

Swingset, have you seen this?....

I'm mulling over gearing choices for my old XL250 right now.
From the XL forum....
[QUOTE=jitterymonkey;]

Hate to keep beating a dead horse, but I'm gonna

The wheels are done & the new Pirelli MT43s are mounted for my '72 XL250.
But, I can't decide which sprockets to use.
Mainly be commuting on paved back roads (35-45 mph) during the week &

I have these new sprockets to try...14/15 front & 42/48 rear

15x42 (2.80)
14x42 (3.00)
15x48 (3.20)-Stock gearing for my '72 XL250 (45-50 mph max)
14x48 (3.43)

Of course the 42 rear would be great for my on road commute.
But will it work in the dirt & Ohio/WV mud?
& (of course) the 48 tooth would be better off road.
But will it put to much strain on the motor trying to keep up with traffic?
(even if it's just back roads)

Anyway, writing it all out kinda helps (thinking about trying 14x42 first.
______
__________________
[rtwdoug] Just drop me in there with a Honda XL250
(something I wont cry over if I hafta leave it, plus, they are damn near bulletproof)

[joefast14] Never modify a Yamaha SRX-6, they turn into a money hole that you can never get out of.

 03-08-2011, 11:05 PM #34974 buildit Guns, bikes and Bows     Joined: Jun 2006 Location: Simpsons home town Ohio Oddometer: 14,290 You all are lucky, I've tested my KLR with the following sprockets 15/43 14/43 15/45 14/45 13/45 All I found was with a 13/45 I could pull a wheelie with only half throttle. Chain ware was not effected to any obvious amount. Currently I think the 15/45 setup in on there. __________________ http://www.youtube.com/user/advfilmer 2013 Super-10 2007 KTM950SEr 2006 KLR650 2001 YZ426 (street Legal)
03-08-2011, 11:12 PM   #34975
swingset
Got the knack.

Joined: Mar 2008
Location: Central Ohio
Oddometer: 10,924
Quote:
 Originally Posted by jitterymonkey Hmmm. Not sure if it's true or not, but it's something to think about. The right gearing is very important & new sprocket/chain sets ain't cheap. Swingset, have you seen this?.... http://www.advrider.com/forums/showt...hlight=gearing

http://www.gearingcommander.com/

According to this, with a 16/42 combo, and 112 links in a chain, my front sprocket has the same link in the same tooth every turn, the rear every 3 turns and both sprockets at the same position every 3 turns....that's opposed to the stock gearing being 17/41 which means the front goes 17 rotations, the rear 41 rotations, and the combination only lines up every 697 rotations.

That's quite a difference. I'm not sure how it affects wear, but that's not a marginal difference in mating surface time over the course of thousands of miles. The math works out to every mile traveled, my current gearing would have the same link in the same tooth 200x more than stock gearing. Apply that across 20k miles? I could see that affecting things.

Dunno, I'm not a structural engineer so I guess there's more at work than just the math on same/same contact, with regards to faster wear...would probably depend on tiny differences between one link/tooth and the ones next to it and the same goes for the links.

 03-08-2011, 11:30 PM #34976 MeefZah Curmudgeonly     Joined: Nov 2003 Location: New Philadelphia, Ohio Oddometer: 10,993 Just ride it, Craig. __________________ "A man turns his back on the comforts of home, and when the dust all settles and the story is told, history is made by the side of the road..." - DBT My Smugmug Galleries
03-08-2011, 11:38 PM   #34977
buildit
Guns, bikes and Bows

Joined: Jun 2006
Location: Simpsons home town Ohio
Oddometer: 14,290
Quote:
 Originally Posted by MeefZah Just ride it, Craig.
Wait, isn't it spring? So technically he has fixed it up and now needs to sell it and order a Tenre, tiger or 800GS.
__________________
2013 Super-10
2007 KTM950SEr
2006 KLR650
2001 YZ426 (street Legal)

 03-09-2011, 03:12 AM #34978 rich_mc Full Fledged MEM-Ber     Joined: Feb 2005 Location: Ohio Oddometer: 2,218 As an engineer who has designed custom equipment for 15 years, i've done a number of chain drives.... On roller conveyor, it is extremely common to have 2 roller only a few inches apart with identical size sprockets on each....This would make it so the same links fall in the same teeth on every revolution, and these run for years and years without issue..... I'm not guaranteeing that a bike isn't different, but it seems to me that as long as the bike designer attempted to make the center to center distances of the sprockets be a multiple of the chain's pitch diameter, then all should be fine..... Oh yeah, just ride it.... __________________ I would like to see common sense used more commonly. 2011 Connie 1400
 03-09-2011, 05:10 AM #34979 mic_detonator ride     Joined: May 2009 Location: o`er yonder Oddometer: 794 nice ass! but Who let teenie in here? Got the ride out for a spin last night. Wow..... Meef i'm puttin change in a jar for tickets, also who works in town right now so that in case i get pulled over i can drop a name? lol Maybe if the flood of "11" holds off today i can ride a motorcycle instead of a jetski!
03-09-2011, 05:35 AM   #34980

Joined: Jan 2006
Location: Columbus,Ohio
Oddometer: 1,728
Quote:
 Originally Posted by ScienceOfDirt Probably going to take 93 to 643 to 60 if I go. I'm watching the weather. I've got 2 maybes who might tag along. I've got a shake in the KLR at 60-65 that I can't figure out, so it will probably be a lower speed run unless I take something else.
Check to see if the steering head bearing is tight. That will cause it.
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The second slowest rider in district 11.
Time spent riding is not deducted from one`s lifespan.

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