| Author | Message | ||
     Koz5150 |
So I had a 26 tooth sprocket on the front and that was nice. However it was aluminum and wore out. Rather than replace it I am thinking I would like to put a larger sprocket on the back. Originally I was thinking about using a 2004 Sportster 68 tooth sprocket however it looks like the offset would be incorrect pushing the pulley to far out. I am now looking at stepping up to a 70 tooth 2000 - 2006 Softail part. I believ the back can be milled to get the correct offset 9and i have access to a milling machine. I picked up a 2004 sportster belt (136 tooth) which I am hoping will work as I know the 128 will be too short. The pulley diameter will increase by 1 5/8" which I believe there will be clearance for. I know this will reduce my top end, but I can't think of the last time I ran my bike up over 100. For me it is 75 and under pretty much all the time. With the 26 tooth I found myself rarely even using 5th gear as I usually cruise around 3,500 to 4,000 rpm. Thoughts??? I have the belt, but am still looking for the pulley. | ||
| Dave_02_1200 |
Koz, I have been thinking of lowering the final gearing on my M2 for better acceleration but I am not sure that going from a 27 to a 26 in front will be enough of a change to justify the $180 cost. If a modified Softtail rear sprocket and a Sportster belt would work that sounds like a better solution. Have you calculated the RPM at 70 MPH for that combination? Please keep us posted on this. | ||
| M2marc |
I have changed the front sprocket on different bike and it made a huge difference. As long as you didnt mind it sounding like you need another gear around 65 mph. But the sprocket only cost me 20 bucks so it was nothing lost. This is only my opinion based on another bike. | ||
| Koz5150 |
I calculated out that the change to the 26/61 setup was a 3.7% reduction. Here is what I calculated for the rest 27/61 = Stock 27/70 = 12.8% 28/70 = 9.6% 29/70 = 6.4% 26/61 = 3.7% The reason I am using a 70 tooth rear is because they are easy to come by on ebay for under $50. They also look like they will be the easiest to adapt to the Buell rim by simply milling the hub for correct size and back spacing. Additionally, 28 and 29 tooth front sprokets can be easily found also. I liked the 26/61 setup better, but I still rarely found a use for 5th gear unless I was cruising over 80 which i just don't do that often. | ||
| Jayvee |
The 26T front is sold for $139.95, (Pipe Dreamz, in L.A.) I've been monitoring the prices for a while, considering one myself. I guess it's worth all your work to save $90, I would love to have access to a mill... | ||
| Buellistic |
In case you'll don't know, you can decrease the number of teeth on the motor sprocket and do the same thing ... Remember the primary chain runs in oil, so everything lasts longer !!! | ||
| Koz5150 |
Jayvee, I liked the 26 tooth, but I am looking for more. Buellistic, I would love to know more about the motor sprocket reduction. please share! (part numbers and stuff like that) | ||
| Jayvee |
Have you looked at the SportGear by Twistgear? They make a new 5th gear, so you can change the pulleys radically, and supposedly get 14% reduction in 1-4, but keep the top end the same. (I think...) It's another possible solution I looked at. http://www.twistgear.net/page%20html/sportgear.htm l | ||
| Dave_02_1200 |
Buellistic, I too am interested in learning how to reduce overall gearing by changing motor sprockets. Sounds like a great approach. Please tell us more about it. |
