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**2 Stroke HD or UHD Shifter Kit


Product Description


Shift Kit-the ultimate in shifting technology



This HD Shift Kit will fit almost any Chinese 2 Stroke and allow the user to shift gears using the bike's standard rear derailleur. This and our Standard kit are what you see in the YouTube videos. Take a look at the parts list in our installation manual to see what we supply in the standard kit.

The difference between HD and standard kit: HD kit comes with our specially designed Heavy Duty Freewheel for those more aggressive riders and engines with compression mods.

The HD Shift kit also now comes standard with the complete 131.5mm Bottom Bracket Cartridge

Note that this kit comes with typical mountain bike style crank arms and requires 9/16" pedals. If you have a one piece crank you will most likely need to purchase new pedals.

The kit is also designed for engines with 6 mm rear mount hardware. If your engine is one of the few that has the 8mm rear studs some modification will be required.

Here are links to additional information, read carefully before purchasing:

Product Description
Requirements for using the kit
Bottom Bracket Descriptions
Installation Manual

SBP also suggests a chain breaker, cartridge bottom bracket tool and crank tool to install this kit.

Do not forget to measure your seat tube and select the appropriate size.

NOTE: If you are attempting to use this kit on a "FAT TIRE" bike please note the following additional items are required.
12 inch shaft
5/8 lock collar

Also note you will use the bottom bracket on your bike instead of the one that comes in the kit.


Product Reviews

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Showing reviews 1-20 of 39 | Next

  1. Stay on top of it! 3 Star Review

    Posted by on 06 02 2019

    For the money, I think I should have stayed with a single 36 tooth sprocket.
    I will say this, if you stay on top of it everything is aligned correctly and nice and tight it works nicely it gives you options. I think what I need to do is find a better heavy duty chain for the primary I've already gone through 3 in a month. I can tell the brass washers/shims for cog alignment,are almost done already. This is a great kit for an Experienced two strokebikewrenchmonkey, being one myself.

  2. Well Made Kit 4 Star Review

    Posted by on 04 15 2019

    The kit is very high quality and it is going together well. My only issue with the kit is a missing nut on one of the 1 1/4" clamps.

  3. great 5 Star Review

    Posted by on 03 08 2018

    Fast shipping

  4. Really glad I got this 5 Star Review

    Posted by on 03 03 2018

    It arrived in four days which blew my mind to begin with. Nicely packaged. The construction of the parts seems of very good quality and it fits well. I can't wait for Spring.

  5. great quality 5 Star Review

    Posted by on 12 29 2017

    It shipped very fast, and the packaging was excellent. This is hands down the best engineered product I've installed on any motorized bike. The instructions are great.

    The pieces in the kit are seemingly high quality, except the bottom bracket leaves a bit to be desired. Mine is not perfectly true. I clocked the drive side crank arm in every possible position and went with the truest spot.

    Getting the kit to work on an engine with 8mm rear studs was a bit of a challenge as well, but can be done. First task was drilling the holes larger. No big deal. For screws, I ended up using an allen screw on one side. On the other side that is below the plate I used a bolt with a 13mm head, and cut the opening a little larger (using a standard dremel and cutoff wheel) so I could fit the back end of a wrench inside. I also had to lightly grind the spacing shims to fit between the 8mm studs.

    After that, everything fit great and it was smooth sailing. I haven't tried it out yet because I'm waiting on a few unrelated parts, but I'm very excited. SBP has gained a customer for life after my experience with this shift kit. Can't say enough good things.

  6. great kit 4 Star Review

    Posted by on 11 15 2017

    everything fit perfect other than my bottom bracket was seized but it would have worked well. quality was excellent!

  7. great product great company 5 Star Review

    Posted by on 09 29 2017

    First off I would like to state im deployed and the shift kit was shipped here way faster than I expected. After it arrived the box was very well packaged and wrapped with plenty of tape to keep it sealed. Inside the box was a very neat individually wrapped set of parts for the kit that all look to be amazing quality. I haven’t had a chance to install it yet awaiting my zeda dio reed engine and doing the install with the new engine. At this time I would recommend this company to anyone looking for a legit jackshaft kit big shout out to sick bike parts!

  8. Awesome product 5 Star Review

    Posted by on 09 16 2017

    I installed this shift kit on my bike. Overall I like it and I am pleased with it. It would have been nice to have a set of printed directions with it. I would buy another one of this kits if I build another bike. It made the bike way more fun to ride.

    SBP: Thank you! Did you have trouble printing our pdf?

  9. Amazing 5 Star Review

    Posted by on 08 04 2017

    The kit came packaged in a box very well organized. Each item individually wrapped.
    It took me about 2 days to install the kit. Day one was the install, day two was for testing and adjusting to make everything perfect. It works very well, at least doubled my bike speed, and now my motor has a much better mount on the bike frame (very solid). I will most likely purchase another kit for my other bike in the near future. Thank You.

  10. 5 Star Review

    Posted by on 09 16 2016

    I bought the new kit with the UHD FW. The kit was was great before, this thing is a tank. You need to take your time with Shifter Kits, but always worth it. SBP have done a darn good job coming up with something that fits so many bikes. I've seen the knock off kits and they are pure junk. Will be back for more!!

  11. 5 Star Review

    Posted by on 05 15 2016

    Super fast shipping! This is hands down the best investment I've ever made. Thank you guys so much!

  12. 5 Star Review

    Posted by on 06 15 2015

    First I want to thanks to SBP for their outstanding fastest shipping. My package arrived in 1 day. I'm going on vacation right now as I'm writing this review. But soon as I get back I will make a video how to install this on your bike. I use Mustang Racer from Bikeberry for all my bikes I make

  13. 5 Star Review

    Posted by on 10 08 2014

    this kit is killer fast my bicycle has 700c tires & in 7th gear out of 8 i was going 55mph no joke its way better than that rag joint beating up ya spokes

  14. 5 Star Review

    Posted by on 06 20 2014

    First off,as always,thanks to the great staff at SBP for their great service and quick delivery time ! Now on with the review of the HD Shift Kit ... I would have to say that after building numerous motorized bikes now, that have been single speed,I am forced to wonder why I've never bolted up one of these kits sooner !! It just totally transforms what used to be a pretty cool and fun bike too ride into an unbeleivable motorized bike to ride ! All of a sudden I can climb any hill with ease and standing starts are a matter of letting out the clutch and rolling on the throttle ! No more "pedal assisted" starts ! Then you just shift yer way througfh the gears and cruise along side traffic with ease and w/out "sceaming' along side them ... way easier on the motor and a pleasure to ride !
    The kit itself is very good qaulity and if your having trouble figureing it out just check out u-tube videos or give the boys a call at SBP they'll help you out. Try one you won't be disapointed !

  15. 5 Star Review

    Posted by on 06 06 2014

    First time it's not easy to understand as a French with no mechanical instruction but finally when it's operating and understood it's rock all the way .

    Very happy with this kit.

  16. 5 Star Review

    Posted by on 04 05 2014

    This kit is way more than you expect. Be sure you are putting this kit on a quality bike with plenty of room. But even on a really tight fit like mine this kit is totally epic. Bike huals way more booty than just a single speed kit. Its nice to have a choice of what gearing to run. Hills no problem, Mushy ground no issue, high speed down the road? You bet. This kit really takes a skilled hand to install, but with the quick knowledgeable staff at SBP you are far from on your own. A+ great kit.

  17. 5 Star Review

    Posted by on 02 08 2014

    awesome product! takes time, pacience, and strong mechanical knowlege. not as easy as bolying up a motor and shortening a chain, so if you dont have a strong mechanical mind, find someone to help.

  18. 5 Star Review

    Posted by on 12 11 2013

    This company is the best. From their online catalogue, quick email response , super fast shipping, superb packaging, last but least the quality of their parts. If all companies were this good we would be a great nation again. I found nothing to be even the least bit out of order or needing to be of higher quality. I would guess their parts are of much higher quality than the bikes they are being installed on. At this rate I probably do this again just for the pleasure of the experience ......Eric

  19. 5 Star Review

    Posted by on 11 26 2013

    Well, For starters i bought the more expensive 2 stroke HD shifter kit because of the reviews i read about the cheaper regular shifter kit's Freewheel kit problems. after being bit before by cheaper deals and so many people said the freewheel was better with the HD kit, i decided it was time for 'Better Safe than Sorry' and i went with the quality one. i recieved it saturday evening and had it installed by sunday night and took it out for a test run. (I had to get some tools to install it and i didn't even use the Crankshaft that was sent. my original crankshaft was wide enough) when i put to the real test yesterday morning, the expression in my mind changed from "Wow"! to "WHOOO!" With only the engine kit i was able to reach 25- 28 MPH ind i would get home from work in 25 minutes. back then i called it the "Spec-1 upgrade"... but NOW with the shift kit i was cruising at 40 MPH and i get home in 15-20 minutes, so i now call my bike the "Spec-2 Evolution"! i've gotten so many astonished looks from people riding beside me in traffic! whenever i stopped at a traffic light at least 4 people asked me where i got the motor and shift kit. and one person even asked me if i would build one for him, so i might be buying another one from you in the near future! but anyway i totally love this kit, THANK YOU SOOOOO MUCH Sick Bike Parts!

  20. 5 Star Review

    Posted by on 11 03 2013

    Well I have bought two of these kits and both kits came together without to much hassle the quality is right on the money I will be doing business again and again. Thumbs up SBP

Showing reviews 1-20 of 39 | Next

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