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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.
8 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 44 | Next

  1. Top Stuff 5 Star Review

    Posted by on 02 10 2021

    As always SBP delivers, the kit arrived today, my second kit, everything is there and top quality. I'll be back.

  2. will work good....but 3 Star Review

    Posted by on 07 09 2020

    This kit will work great if your mechanically inclined and don't have a problem customizing it. This kit is definitely not for a beginner and definitely does not just bolt in. I think thats partially due to the variations in the Chinese engines. Expect to put it on and take it apart at least 6 times before you get it right and everything lined up etc. Also expect your frame to get scratches and gouges from this kit. Overall a great kit.

  3. Totally awesome! 5 Star Review

    Posted by on 02 15 2020

    Wow how much fun. Very well put together kit the pdf instructions are easy to follow. No don't go thinking this is for beginners though for this is a timely process put together take a part put back together fit file refit and so on and to top it off I had to modify for 8mm studs but overall a great kit and well thought out. I went with the chain tensioners also highly recommended both or at least the left side it makes getting the chain tension much easier. I bought the kit for the hd freewheel but once I got it started to look at the cheaper kits and there brackets are different and don't look to be as strong or very well put together you get what you pay for just remember if you want to go fast don't be cheap or it can hurt! Well worth the money and time to install. And I had some questions emailed the guys and they responded! And were helpful very impressed with that not a common thing in the motorized bike industry. Thanks for making a quality product and standing by it with customer service you rock

  4. Great Jackshaft 5 Star Review

    Posted by on 10 23 2019

    Everything about this kit is so well made and comes with everything needed for the install.

  5. Greatly enhances motorized bicycling 4 Star Review

    Posted by on 10 17 2019

    It’s a really nice kit with quality components. Just be prepared to do A LOT of grinding, filing, and sanding to get everything to fit together. It makes a mess putting it together with little shards and flakes of metal everywhere so don’t let your dogs around while you’re working on it, otherwise they will be licking their paws the rest of the day. Took me a few days to get everything right, but so far after a 50 mile ride it has held up great! Just keep an eye on the square keys and really torque down the set screws on the jack shaft, otherwise you’ll just be spinning your gears. Thanks SBP, it’s great to have this on the bike! 4/5

    SBP says: Thanks for the review. We would love to know what you did a LOT of grinding, filing, and sanding on. Doesn't sound normal. Contact

  6. 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.

  7. 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.

  8. great 5 Star Review

    Posted by on 03 08 2018

    Fast shipping

  9. 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.

  10. 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.

  11. 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!

  12. 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!

  13. 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?

  14. 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.

  15. 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!!

  16. 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!

  17. 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

  18. 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

  19. 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 !

  20. 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.

Showing reviews 1-20 of 44 | Next

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