Big Jeff Posted October 4, 2003 Share Posted October 4, 2003 I overheard someone mention that droping a tooth on the front sprocket is hard on your bike. Is there any truth to this ? Big Jeff Quote Link to comment Share on other sites More sharing options...
blackhawkxx Posted October 4, 2003 Share Posted October 4, 2003 The motor will now turn more RPM's at the same MPH, so in theory, yes. In the real world, no. Quote Link to comment Share on other sites More sharing options...
Northman Posted October 4, 2003 Share Posted October 4, 2003 No harder on your bike than riding 10mph faster is, and we all do that................... :roll: Blackhawk is right, it's a little more rpm, a little less radius the chain has to turn around, but very minimal. If you slapped a 14 tooth on there, then there's a substantial increase in RPM and wear on the chain, but 16 won't change much, except for your grin factor. Quote Link to comment Share on other sites More sharing options...
Obby Posted October 4, 2003 Share Posted October 4, 2003 :shock: Does that mean I can do more wheelies sir? Quote Link to comment Share on other sites More sharing options...
Guest Posted October 4, 2003 Share Posted October 4, 2003 :shock:Does that mean I can do more wheelies sir? I dunno Obby, mine won't do wheelies. I think I got a bad one Quote Link to comment Share on other sites More sharing options...
Pete in PA Posted October 4, 2003 Share Posted October 4, 2003 Boy Joe, a little bored there or new abacus to play with? :razz: Now imagine, there are a couple of bikes out there with 13 factory teeth, you might as well R@R the front sprocket every 2k miles. Quote Link to comment Share on other sites More sharing options...
86gn Posted October 4, 2003 Share Posted October 4, 2003 Has anyone gone 1 tooth over? What is it like? Does the speedo read accurate? Quote Link to comment Share on other sites More sharing options...
tomek Posted October 5, 2003 Share Posted October 5, 2003 I don`t want to sound like a smartass but calculation made by rockmeupto125 is ahhh,well there is an error or two. Lets say XX makes 85 pounds of torque at peak,with 1.57 primary ratio and 1st gear ratio of 2.77 total torque of 85x1.57x2.77= 369.7 is applied to a counter shaft in the first gear. In the 6th it would be 85x1.57x1.04=138.8 foot pounds of torque to the small sprocket. You can`t really talk about torque in relation to the tooth,force-yes. To calculate force apllied to the tooth you need to divide torque by number of teeth in the contact with chain and divide again by the radius of the sprocket ( from the center to where chein meets tooth). I don`t have the radius of the sprocket in the top of my head and my girlfriend cleaned my desk,so there is no parts laying aroud,lets say it is 1/8 of the feet. Here is how much force is on the tooth in the first gear- 370:8:1/8th=370 pounds. What about the chain? 370 times number of teeth in contact-8,370x8=2960 pounds pounds of force on the chain. As you can tale I`m a geek Quote Link to comment Share on other sites More sharing options...
DaveK Posted October 5, 2003 Share Posted October 5, 2003 Lets say XX makes 85 pounds of torque at peak,with 1.57 primary ratio and 1st gear ratio of 2.77 total torque of 85x1.57x2.77= 369.7 is applied to a counter shaft in the first gear. Â In the 6th it would be 85x1.57x1.04=138.8 foot pounds of torque to the small sprocket. 370:8:1/8th=370 pounds. Â 370 times number of teeth in contact-8,370x8=2960 pounds pounds of force on the chain. DAMN...I started my calculations last WEDNESDAY.......and I just finished...... it all checks out. He is right :razz: Quote Link to comment Share on other sites More sharing options...
Pete in PA Posted October 5, 2003 Share Posted October 5, 2003 Geez, knock it off with the math already! What do you guys do for a living, figure out decaying orbits for satelites so they don't crash on us? I'm happy I can figure out gearing ratios if I change my gearing. :roll: Quote Link to comment Share on other sites More sharing options...
blackhawkxx Posted October 5, 2003 Share Posted October 5, 2003 Well, talk about decaying orbits.......I think I'll just slink away into the asteroid belt someplace.... Someone once told me to Never do math in public and I don't. But, we still love you Joe. Quote Link to comment Share on other sites More sharing options...
kwxx Posted October 6, 2003 Share Posted October 6, 2003 Wouldn't the smaller countershaft spockets increase radial loading on the countershaft bearing? Anyone care to calculate increase? Quote Link to comment Share on other sites More sharing options...
AlphaBird Posted October 6, 2003 Share Posted October 6, 2003 Wouldn't the smaller countershaft spockets increase radial loading on the  countershaft bearing? Anyone care to calculate increase? Hmmmmm.... math aside my 520 counter shaft sprocket -1 (on the 929) was waaay worked---but I think in this case it had more to do with the thickness---at 8K track miles it was waaaay "hooked"_ I am very happy I inspected it prior to re-install Quote Link to comment Share on other sites More sharing options...
Northman Posted October 7, 2003 Share Posted October 7, 2003 All right, tomek, you did the calculations. :shock: What can you conclude, besides you need a girlfriend, or at least Pay-per-view? Was Joe "in the ballpark" with his estimate of increased load on the sprocket/chain? Quote Link to comment Share on other sites More sharing options...
demon Posted October 7, 2003 Share Posted October 7, 2003 When you replace the chain with a 16 tooth sprocket, do you need to get a 108 link chain rather than the 110 link chain that is stock?? Quote Link to comment Share on other sites More sharing options...
RodeRash Posted October 15, 2003 Share Posted October 15, 2003 If tooth loading concerns you, you can always keep the stock size front spocket, and add 2 or 3 teeth to the rear. (You'll probably also need a slightly longer chain) Quote Link to comment Share on other sites More sharing options...
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