[Rando]

$149.95

http://cgi.ebay.com/ebaymotors/Can-Am-Spyd...sQ5fAccessories

[asmdjackal]

Rando, on Jul 15 2009, 06:40 PM, said:

$149.95

http://cgi.ebay.com/ebaymotors/Can-Am-Spyd...sQ5fAccessories

I emailed them for more info... I am curious what the before/after RPM's are certain speeds.... Issues with speedometer, etc...

Very cool though if it makes significant rev drops!

[Tarantula]

Rando, on Jul 15 2009, 06:40 PM, said:

$149.95

http://cgi.ebay.com/ebaymotors/Can-Am-Spyd...sQ5fAccessories

It sounds good to me! Its about time somebody did something about the spyder running out of gears too quickly. One tooth smaller? not much...but better than nothing. I might just get this.

[Twodog185]

I received an email from Mels Garage. Attached is a graph that's supposed to show the difference between the OEM 28 tooth, and the MMG 29 tooth aftermarket.

After consultation with a drag racing friend of mine, the MMG graph is....off. We think. MMG used "test points" but didn't clarify if those points are related to speed.





However, without specifics, we generated a graph that the test should look like.

[Tarantula]

Twodog185, on Jul 17 2009, 10:27 AM, said:

I received an email from Mels Garage. Attached is a graph that's supposed to show the difference between the OEM 28 tooth, and the MMG 29 tooth aftermarket.

After consultation with a drag racing friend of mine, the MMG graph is....off. We think. MMG used "test points" but didn't clarify if those points are related to speed.





However, without specifics, we generated a graph that the test should look like.

Yeah I think its probably a little off....saving 250RPM is not much....I know on one of my motorcycles I went with a rear sprocket that had 5 teeth less and I basically gained a whole gear. 5th gear feels like 6th gear. First gear on the other hand not as strong.

[evoluzione]

there are a couple points i would make about this sprocket. first, it the manufacturer can't even do the most basic of calculations to determine ratio change i would have to wonder about the design (a sprocket requires very tight tolerances and accurate calculations to ensure proper belt life). i'm not saying they didn't build it correctly but just bringing up a point.

also, there is a reason aluminum is not used for front sprockets - the loads are much greater on the drive sprocket and this will tend to wear the sprocket & belt very quickly. and it appears that the sprocket is not hard anodized which would also lead to quick wear. and with a drive belt running $400-$500 you don't want to replace them sooner than needed. has anyone asked mmg how many miles they've tested the sprocket? unless they've gone 20k miles or more and can show the wear i would be hesitant.

as to the ratio calculations, the stock ratio (79/28) is 2.8214 with the new ration (79/29) being 2.7241. here are some correct numbers (stock/mmg):

3400/3283
3600/3476
3800/3669
4000/3862
4200/4055
4400/4248
4600/4441
4800/4634
5000/4828
5200/5021
5400/5214
5600/5407
5800/5600
6000/5793
6200/5986
6400/6179
6600/6372
6800/6565
7000/6759

hope this helps.

[Capt.Jim]

seems to me you would need a slightly larger belt or move the rear axle forward all the way, i don't get it.

[Rodney]

Evo is right about the load. Im sure he has done his homework on this before. The new aluminum sprocket is not going to last. Not that I would not love the added gear ratio on the highway. Can anyone cut us a steel one?

[medeff]

This sprocket is from the same people that build the trailer hitch that mounts on the swing arm. They're idea of testing the hitch was to stand on it andpull a trailer for three hundred miles. it would not suprise me if they tested the sprocket with the same standerds

[asmdjackal]

Capt.Jim, on Jul 18 2009, 10:34 PM, said:

seems to me you would need a slightly larger belt or move the rear axle forward all the way, i don't get it.

I agree - that is where a say a 29 or 30 tooth front sprocket and a smaller rear sprocket would get you "better" RPM savings and also be able to use the same belt since your compensating.

Ken, got that done yet?

[2faston3]

I am not condoning the sprocket but want to point out one thing for clarification.

I am a plating lab tech in a captive plating shop for a large company that produces military products.

We hard anodize belt sprockets (mil spec Mil-8625F) for air planes. They meet the spec and show very little wear after 100`s of hours of use. So if an airplane can use it certainly a motorcycle could use a aluminum sprocket for a it`s belt drive `IF` Hard Anodized...

Just sayin

2faston3

[widowmaker2011]

2faston3, on Jul 29 2009, 10:20 PM, said:

I am not condoning the sprocket but want to point out one thing for clarification.

I am a plating lab tech in a captive plating shop for a large company that produces military products.

We hard anodize belt sprockets (mil spec Mil-8625F) for air planes. They meet the spec and show very little wear after 100`s of hours of use. So if an airplane can use it certainly a motorcycle could use a aluminum sprocket for a it`s belt drive `IF` Hard Anodized...

Just sayin

2faston3

Agreed......A few aftermarket companies sell aluminum front sprockets for modded harleys for drag racing , have seen quite a few with no issues so before we bash , maybe we should do some research and/or wait for a ride report. just sayin.

[evoluzione]

2faston3, on Jul 29 2009, 07:20 PM, said:

I am not condoning the sprocket but want to point out one thing for clarification.

I am a plating lab tech in a captive plating shop for a large company that produces military products.

We hard anodize belt sprockets (mil spec Mil-8625F) for air planes. They meet the spec and show very little wear after 100`s of hours of use. So if an airplane can use it certainly a motorcycle could use a aluminum sprocket for a it`s belt drive `IF` Hard Anodized...

Just sayin

2faston3

no doubt anodizing would help - when i made the post there was no mention of anodizing (type 2 or 3). now they state that they are "hard anodized to rockwell 65" - not sure if that means type 2 or type 3? i'm used to "hard anodizing" meaning type 3, class 1 which gives a dark, muddy finish and tends to "chip" at hard edges (due to the thickness). obviously based on the photos they are using a clear anodize which makes it a type 2. but my main concern with the aluminum sprocket (and why 6061 instead of say 7075) was the broached center where the highest loads will occur.

again, they may have done all of their homework and have built a quality product - i just wanted to bring up a couple points so potential customers would know what to ask. the fact they added the note about anodizing shows that someone brought it up.

[asmdjackal]

evoluzione, on Jul 29 2009, 11:01 PM, said:

no doubt anodizing would help - when i made the post there was no mention of anodizing (type 2 or 3). now they state that they are "hard anodized to rockwell 65" - not sure if that means type 2 or type 3? i'm used to "hard anodizing" meaning type 3, class 1 which gives a dark, muddy finish and tends to "chip" at hard edges (due to the thickness). obviously based on the photos they are using a clear anodize which makes it a type 2. but my main concern with the aluminum sprocket (and why 6061 instead of say 7075) was the broached center where the highest loads will occur.

again, they may have done all of their homework and have built a quality product - i just wanted to bring up a couple points so potential customers would know what to ask. the fact they added the note about anodizing shows that someone brought it up.

Word is that they are indeed hard anodized and should be greater than or equal to the factory sprocket in terms of strength and durability. Also, the 1 tooth increase will indeed work with the factory belt. Anymore than that and you need to lengthen the belt. I got this info from the horses mouth by the way...

[doctor]

asmdjackal, on Jul 31 2009, 12:10 PM, said:

Word is that they are indeed hard anodized and should be greater than or equal to the factory sprocket in terms of strength and durability. Also, the 1 tooth increase will indeed work with the factory belt. Anymore than that and you need to lengthen the belt. I got this info from the horses mouth by the way...

How far will you have to travel with the new sprocket to break even with the small gas saving?

[asmdjackal]

doctor, on Jul 31 2009, 06:34 PM, said:

How far will you have to travel with the new sprocket to break even with the small gas saving?

I am not interested in a larger front sprocket for gas savings. I am interested in 2 other things - 1, reducing RPM a bit more - the Spyder begs for another gear at highway speeds... 2, in preparation for eventual boost hitting my spyder, I want to load it a bit more on the bottom end.

What we really need is a larger sprocket on the front and a smaller on the rear - give us a 750-1000RPM drop at 75MPH and you can still use the stock belt.

[doctor]

asmdjackal, on Aug 1 2009, 11:12 PM, said:

I am not interested in a larger front sprocket for gas savings. I am interested in 2 other things - 1, reducing RPM a bit more - the Spyder begs for another gear at highway speeds... 2, in preparation for eventual boost hitting my spyder, I want to load it a bit more on the bottom end.

What we really need is a larger sprocket on the front and a smaller on the rear - give us a 750-1000RPM drop at 75MPH and you can still use the stock belt.

You'll be slipping the clutch in first gear for take offs with that kind of gearing. Unless you can pull redline in high gear, and I know of none that will, the stock gearing should be right.

[Kevin Merrill]

evoluzione, on Jul 30 2009, 12:01 AM, said:

no doubt anodizing would help - when i made the post there was no mention of anodizing (type 2 or 3). now they state that they are "hard anodized to rockwell 65" - not sure if that means type 2 or type 3? i'm used to "hard anodizing" meaning type 3, class 1 which gives a dark, muddy finish and tends to "chip" at hard edges (due to the thickness). obviously based on the photos they are using a clear anodize which makes it a type 2. but my main concern with the aluminum sprocket (and why 6061 instead of say 7075) was the broached center where the highest loads will occur.

again, they may have done all of their homework and have built a quality product - i just wanted to bring up a couple points so potential customers would know what to ask. the fact they added the note about anodizing shows that someone brought it up.

It is Type III hard anodized I belive.

[Dudley]

I cannot see any benefit in changing sprocket sizes. As it is, when RPMs get below 5000 on the highway I lose top end power and speed and have to drop to 4th gear to bring it back up. So, if the RPM were reduced through a different sprocket, the top end power would be lost in 5th gear unless you kept the speed at 80 MPH or better, which is illegal in most states. So what's the purpose?

[asmdjackal]

Rando, on Jul 15 2009, 06:40 PM, said:

$149.95

http://cgi.ebay.com/ebaymotors/Can-Am-Spyd...sQ5fAccessories

Word is they just completed the 30 tooth sprocket as well and it STILL can use the stock belt.