"Customer service is priority #1 at Rocky Mountain ATV/MC. We value our customers and strive to be the best shopping experience- when you buy from us, you are buying lifetime service."
-Dan Thomas, CEO and Founder
Returns
We take pride in offering no hassle returns. In the event of a return, please call, email or chat with us to receive a solution to the problem. For apparel that doesn't fit quite right, Click here to see our Fit Guaranteed Program.
Warranties
We will stand behind all products we sell with regards to manufacturing defects in workmanship and material. Most products are limited to the manufacturer's warranty. However, we will do everything in our power to take care of the problem.
Have questions?
(Leave email if after hours) Email: sales@rockymountainatv.com Call us: 1 800 336-5437 7am-7pm Mon-Fri 8am-4pm Sat (Mountain Time)
People who have viewed this item have also viewedSee all Drive
Primary Drive Rear Steel Sprockets are made to meet or exceed O.E.M. specifications. Made of high-grade hardened steel, these sprockets are made to be durable and offer long wear. Lightening holes add to the aesthetic appeal while reducing weight. Primary Drive Rear Steel Sprockets are manufactured with precision for a perfect fit. Whether you ride a motorcycle or ATV, Primary Drive is sure to offer the best value in sprockets.
Durable replacement steel rear sprocket for motorcycles and ATV's.
Designed to O.E.M. specs using a high-grade hardened steel.
Heavy duty sprocket at an incredible price. Haven't ridden with it yet but it's price alone makes it hard to pass up. Only giving it one star because I haven't used it yet.
I really like primary gear sprocket , very durable last a long time
I really like primary gear sprocket I redo bikes for kids and they last a really long time so if you're not a professional and don't mind adding the extra weight their top-of-the-line
I bought a driven 45t steel sprocket for my Xr650l. It is way heavier and has much more metal in it than the JT equivalent. So much that I didn’t bother installing it. It is also designed with multiple mount patterns. This is probably to save cost but adds a lot of weight. If you want a steel sprocket for your Xr650l and don’t want to add considerable weight. Consider something else.
I ride hard! Primary Drive sprocket out last renthal, this is steel so as long as your not trying to reduce overall bike weight buy this one! Must bang for your buck!
Nothing beats these sprockets for the money. Durable as all get out, cheap, and good fit. Sometimes the outer coating peels off, but that doesn't matter to people that buy $20 sprockets. We just want something durable and cheap.
I had read online that a lot of people have change the gearing on my particular motorcycle, a 2013 WR 250 R. This rockets really changed the entire bike and how it handled out in the desert from the start hearing. The price was good easy to install and it really changed the entire bike. I highly recommend these products
Fits perfect, I changer both sprockets and the chain at once per recommendations online and haven’t had any trouble at all. I geared olio a tooth on the front and it made a lot of difference, very nice on a gen2 KLR anyway.
I would recommend this item to any one I use a lot of their parts and they never let me down well made products for your bike out there and they have a lot to choose from for your needs put their parts to the test at every race
Perfect fit, seems just as durable as OEM, if not more. I have a few thousand miles on it so far and notice no irregular wear. My only complaint, I wish they had it in black.
i got this sprocket a while back for a 2007 klr650 and after about 1000 miles of not particularly gentle use (a couple of parking lot wheelies come to mind) i noticed it starting to twist. out of pure curiosity and disregard for the rest of my drive train i decided to see how much farther i could push it before i just couldn't run it any longer. i wound up making it to an estimated 1500 miles before i deemed it unusable, it was missing half the teeth if not more, warped entirely around the chain to the point that the chain was clicking in to the sprocket and then clicking back out like a seat belt instead of just a smooth in around and over. over all for $11 i'm impressed that it went this far, the install was seamless, but as compared to how a more expensive sprocket would last it really wasn't that long. the only real use i can think of for it is to throw a cheap but functioning part on a bike you're about to sell just to make it look a little better than a sprocket with 5,000 miles on it and maybe get a little more money for it, though doing it would make you an absolute cur. the best comparison i can make would be a fast food burger, for the price it's alright, but it will never really compare to something that you spent a little more money on.
Bought this to give the WRR more low end for tractoring around in the woods. Bolts right up, no new bolts needed as it has both style holes. Went from stock 13/43 to 13/47. Bought a 120 link chain so that I would have enough links to use stock chain later on as bike was new.
Can't beat the price on these. Got this sprocket as part of a sprocket and chain package. Both sprockets and chain for the price of just the chain from DID for example. I'm not a racer just a casual rider the extra weight doesn't bother me at all.
If you are not concerned about the weight of your sprocket, then this one will be fine for you. It weighed in at 3.4lbs in the package. I sent it back and bought a lighter weight steel sprocket. Didn't mount it. Not rating anything but the weight of the part.
I have a few rides on this sprocket, seems fine and fit well. I want my race bike to be a trail bike and so the 51 tooth rear combined with a 12 tooth front replacement has the tractor effect I needed.
BEST ANSWER:I only run these because I ride a lot of sand, and aluminum sprockets get worn out too fast in sand. It will surface rust but there will not be enough rust where you will have to worry about this. The paint holds up good. It'll rust on the teeth that touch the sprocket.
BEST ANSWER:I only run these because I ride a lot of sand, and aluminum sprockets get worn out too fast in sand. It will surface rust but there will not be enough rust where you will have to worry about this. The paint holds up good. It'll rust on the teeth that touch the sprocket.
Technically, anything steel can rust, but with that being said, we haven't had one rust yet, except maybe light film between teeth where chin rides, but as soon as you move, it's gone. Think of your rotors. They rust much?
I have used these sprockets for years, and they do not show signs of rusting. However, it is a good idea to spray your chain and sprockets with WD40 after washing your bike. Make sure you don't get any on your brake disc.
I currently run a 13 front and 48 rear sprocket on a YZ250F. I find I am a little high geared for the type of riding I do. I am wondering if I should go with a 50, 51, or 52 tooth rear sprocket?
BEST ANSWER:Not sure what the stock gearing is for that bike butgeneral rule of thumb for gearing is if you want to go faster than you would change to a bigger front sprocket and a smaller rear sprocket, if you want more bottom end pull then use the stock gear in the front and go bigger on the rear. Even 1 extra tooth will make a big difference. I run 14/50 on my CR500 and 13/50 on my CRF450 and it's a perfect balance between speed and torque
BEST ANSWER:Not sure what the stock gearing is for that bike butgeneral rule of thumb for gearing is if you want to go faster than you would change to a bigger front sprocket and a smaller rear sprocket, if you want more bottom end pull then use the stock gear in the front and go bigger on the rear. Even 1 extra tooth will make a big difference. I run 14/50 on my CR500 and 13/50 on my CRF450 and it's a perfect balance between speed and torque
A change of 1 tooth on the rear sprocket is barely noticeable to most riders. 2 teeth more on the rear sprocket makes a small difference. If you're bogging or stalling the engine too often with the current gearing I would suggest the 52 tooth sprocket. This will provide more useable torque on slow tight trails. Also, note it will reduce the bike's top speed by ~ 5 to 7 mph.
Ok thanks. I do a lot of riding in the mountains on some nasty rocky trails and I have stalled it a couple times trying to lug my way through rocky, hilly areas.
I run a 53T on my CRF250R (51T is stock) and it pulls great in tight woods areas. I'm somewhat of a beginner, getting back into dirt bikes and I find this prevents me from stalling in low gears. I' be afraid of going more than 2T bigger than stock in my situation due to the total loss of top end.
BEST ANSWER:In my opinion, based on a couple bikes I have messed with sprocket size changes, plus one tooth front (or minus 3 in rear) is a great starting point. If you want more speed, go more. It you find yourself stalling all the time, or tearing up clutches because your torque isn't where you need it to be, go back the other direction. Being that your bike is only 125cc 4t, I see you running into the torque problem very quickly. The same problem exists with the 2t when doing a hill climb in anything less than full throttle (because of lost torque). Good luck 😉
BEST ANSWER:In my opinion, based on a couple bikes I have messed with sprocket size changes, plus one tooth front (or minus 3 in rear) is a great starting point. If you want more speed, go more. It you find yourself stalling all the time, or tearing up clutches because your torque isn't where you need it to be, go back the other direction. Being that your bike is only 125cc 4t, I see you running into the torque problem very quickly. The same problem exists with the 2t when doing a hill climb in anything less than full throttle (because of lost torque). Good luck 😉
It all depends on the type of terrain you will be riding on. Flat roads? Hilly roads ? Roads with a fair amount of curves? Are you going to be going off road a fair amount of the time ? There are quite a few questions to be answered before picking the sprocket ratio that might be needed to fulfill your needs.
BEST ANSWER:I can tell you that the 50T for the YZ450 is 1192g (I bought one to try it vs the stock 49T). I did not like the 50T so I bought a 49T Primary Drive aluminum, and that was only 375g. That's a 817g (1.8lbs) difference!
BEST ANSWER:I can tell you that the 50T for the YZ450 is 1192g (I bought one to try it vs the stock 49T). I did not like the 50T so I bought a 49T Primary Drive aluminum, and that was only 375g. That's a 817g (1.8lbs) difference!
Will this fit a 2000 TTR125 with the small bolt pattern?
A shopper
on Mar 14, 2017
BEST ANSWER:Yes, as long as this is the way it came stock it will fit your machine. Make sure you enter in the make, model, and year of your machine in the drop down boxes.
BEST ANSWER:Yes, as long as this is the way it came stock it will fit your machine. Make sure you enter in the make, model, and year of your machine in the drop down boxes.
Hi i have a 1987 yamaha warrior 350 that i ordered a rear sprocket for from a local shop when i went to pick it up it only had 4 mounting holes mine has 6 so can you tell me if this spocket has 4 or 6 mounting holes ?thanks
A shopper
on Mar 13, 2017
BEST ANSWER:This one has 4 bolt holes. I also checked the OEM sprocket and it has 4 bolt holes as well. It may be that you have a different sprocket hub than what came from the factory.
BEST ANSWER:This one has 4 bolt holes. I also checked the OEM sprocket and it has 4 bolt holes as well. It may be that you have a different sprocket hub than what came from the factory.
I ordered a 51 tooth steel rear sprocket for my wr450 which has a 6 bolt pattern but the new sprocket has 12- bolt/holes , hoping this is normal ? still looks like it can be mounted ( with 6 additional holes )
I have a 2001 yz 125 and wanted to putchase a 40t rear sprocket but dont know which one will I recieve ?
A shopper
on Nov 25, 2016
BEST ANSWER:These are just a generic picture. You will receive the correct style and bolt pattern for your machine. It will be a steel sprocket in a silver finish.
BEST ANSWER:These are just a generic picture. You will receive the correct style and bolt pattern for your machine. It will be a steel sprocket in a silver finish.
I have a yamaha wr 250r. I wanted to know if I go from my stock 43T rear sprocket to a 47T will my stock chain fit or will I need a new chain? If so what size
BEST ANSWER:You will need to add 2 chain links for every 2 teeth you add or subtract from your sprocket. In this case, you would be adding 4 teeth to the rear so you will need to get a chain that is 4 links longer than your stock chain. Ex: For a 2012 WR250R it has a stock chain length of 108 so you will need to get a 112 link chain.
BEST ANSWER:You will need to add 2 chain links for every 2 teeth you add or subtract from your sprocket. In this case, you would be adding 4 teeth to the rear so you will need to get a chain that is 4 links longer than your stock chain. Ex: For a 2012 WR250R it has a stock chain length of 108 so you will need to get a 112 link chain.
What sprocket am I getting? The picture has 5 sprockets in it and I selected the sprocket I wanted (37 tooth) but still shows all five sprockets, I would like to know what I'm getting before I make a purchase...
BEST ANSWER:It depends on your machine application. Some machines require a larger center hole, some require a different center shape. Most large MX bikes use the sprocket pictured on the right. Most ATV's use the sprocket pictured on the left. Most mini or trail bikes use the sprocket in the middle.
BEST ANSWER:It depends on your machine application. Some machines require a larger center hole, some require a different center shape. Most large MX bikes use the sprocket pictured on the right. Most ATV's use the sprocket pictured on the left. Most mini or trail bikes use the sprocket in the middle.