The Big Picture on Sprocket Changes

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Actually Denver, you may have just saved me both €€€ and potential agro.

Think I'll simply set to my drive train with red/gold/black markers to bling it up a bit ;)
 
Good points, now that my shipment arrived:D For those who have gone to the 41 tooth, is the bike much more wheelie prone under acceleration, or is the difference not that pronounced?
 
ttkarp said:
Good points, now that my shipment arrived:D For those who have gone to the 41 tooth, is the bike much more wheelie prone under acceleration, or is the difference not that pronounced?
Click to expand...

I find it more difficult because of the smoother power curve.

The bike is smoother because the delivery of the power even though higher is more predictable and consistent.
 
youngR said:
Interesting.
Click to expand...

That's what I personally think. With the old sprocket there was an obvious droop and surge in power causing it to be more wheelie prone and less progressive than it is now. Super smooth, I feel like I can accelerate faster with more control.

I have done a -1/+2 on eveyr bike except this, only 2 up.
 
ttkarp said:
Good points, now that my shipment arrived:D For those who have gone to the 41 tooth, is the bike much more wheelie prone under acceleration, or is the difference not that pronounced?
Click to expand...

What did you order? Are you going with the upgrade to 41?
 
i followed Gunny's lead and went with a 40 rear (AFAM quick change longevity kit). i like the idea of working in smaller steps than going with a two-tooth jump, will have it installed along with the Termi slip-on later this week. the negative is that one of the two mods might mask the other in terms of its "improvement" to the overall feel of the motor/bike.

i found this thread to be very helpful......thanks, ;)
 
So this thread clearly lays out the possibilities and seat of the pants impact of the change but wondering whether we have any empirical data yet?

Someone ventured that the 41T would increase RPM in top gear flat out by 250rpm - can anybody offer some data, perhaps from a DDA or other data logging device?
 
Ok, I went out and finally installed the AFAM 520 conversion kit today (light weight). 15T steel front sprocket, 41T Rear (Aluminum), Carrier (Aluminum) and DID ERV3 chain. It really made the bike easier to ride in the streets. Midrange power is really noticeable. I will say quite a bit more power in the midrange. Quicker acceleration and was able to achieve "---" on the speedo with no problem. Didn't have my GPS so I don't know how fast I was going once I reached --- on the speedo and it didn't feel like it was pulling as hard like the 39T did but still pulled some. Power wheelies, a lot easier. Best part for me is it reduced the tall gearing. I can now ride at slow speeds 35 MPH or less with enough power without sounding like I don't know how to shift. All in all I recommend the change. There is a huge weight savings.
 
ScrapperX said:
Ok, I went out and finally installed the AFAM 520 conversion kit today (light weight). 15T steel front sprocket, 41T Rear (Aluminum), Carrier (Aluminum) and DID ERV3 chain. It really made the bike easier to ride in the streets. Midrange power is really noticeable. I will say quite a bit more power in the midrange. Quicker acceleration and was able to achieve "---" on the speedo with no problem. Didn't have my GPS so I don't know how fast I was going once I reached --- on the speedo and it didn't feel like it was pulling as hard like the 39T did but still pulled some. Power wheelies, a lot easier. Best part for me is it reduced the tall gearing. I can now ride at slow speeds 35 MPH or less with enough power without sounding like I don't know how to shift. All in all I recommend the change. There is a huge weight savings.
Click to expand...

---?
 
--- is the speedo maxing out (is it 199+?)

I'm a bit surprised you felt that it wasn't pulling as hard at the top end, surely with a 41T it should be pulling harder than the 39T or is it past peak HP at that point?

Would be amazing to see a dyno chart for 41T conversion compared to stock.
 
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ScrapperX said:
Ok, I went out and finally installed the AFAM 520 conversion kit today (light weight). 15T steel front sprocket, 41T Rear (Aluminum), Carrier (Aluminum) and DID ERV3 chain. It really made the bike easier to ride in the streets. Midrange power is really noticeable. I will say quite a bit more power in the midrange. Quicker acceleration and was able to achieve "---" on the speedo with no problem. Didn't have my GPS so I don't know how fast I was going once I reached --- on the speedo and it didn't feel like it was pulling as hard like the 39T did but still pulled some. Power wheelies, a lot easier. Best part for me is it reduced the tall gearing. I can now ride at slow speeds 35 MPH or less with enough power without sounding like I don't know how to shift. All in all I recommend the change. There is a huge weight savings.
Click to expand...

+1, what I've (and others) have been saying all along for the 14/39.
 
WAfatboy said:
--- is the speedo maxing out (is it 199+?)

I'm a bit surprised you felt that it wasn't pulling as hard at the top end, surely with a 41T it should be pulling harder than the 39T or is it past peak HP at that point?

Would be amazing to see a dyno chart for 41T conversion compared to stock.
Click to expand...

Generally when you go up on the rear sprocket you lose top end and gain in acceleration in low and midrange. If you go larger in the front sprocket you gain top end and loose acceleration in the low and mid. That's why the R went to a 15/41 to gain mid range and the extra 500 RPM from Ti conrods and lighter flywheel so they wouldn't loose top end speed.

When you reach 186MPH or 300KMH the speedo displays ---
 
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Just had the new 15/40 525 drivetrain installed and i'm really happy with the one tooth jump in the rear. While the difference is definitely noticeable (much smoother down low) it doesn't seem to come at any expense at the throttle (not snatchy). I'm not sure that I'd want to jump up yet another tooth; this configuration seems to offer a good balance, maybe the sweet spot amongst the two. Then again, maybe the 15/42 is even better but I'm pretty happy as it is now. Today's ride will tell me more. ;)

file_zps534d756c.jpg
 
ScrapperS said:
Generally when you go up on the rear sprocket you lose top end and gain in acceleration in low and mid range. If you go larger in the front sprocket you gain top end and loose acceleration in the low and mid. That's why the R went to a 15/41 to gain mid range and the extra 500 RPM from Ti conrods and lighter flywheel so they wouldn't loose top end speed.

When you reach 186MPH or 300KMH the speedo displays ---
Click to expand...

Today I went riding and the top sped with the 15/39 was 181 mph on the gps and you right it shows this on the display ---. I Just orderd this set up 15/38 rear with DID zvm-x 525
 

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Rode about 90 miles up in the canyons today.....I'm beyond content with the performance of the drivetrain mod. The new ECU and gearing really help it at slow speeds and at cruising speeds and truly shines in and out of turns. Perfectly suited for the roads I ride. 32mpg avg with it and the Termi slips (baffles out).

Happy :)
 

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