Luna One BBSHD 36 Tooth Chainring

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Read electric-fatbikes review of the Mighty Mini

  • 36 teeth
  • We feel a more ideal gearing than the stock 46 tooth chain for ANY type of riding
  • Increased torque significantly without much loss in top speed
  • 7075 heat treated alloy for durability and lightweight
  • Plated clear coating to resist corrosion
  • Single piece design
  • Ultra lightweight for those rare ebike weight weenies
  • Lovingly machined in California 

This 36 tooth sprocket really brings the BBSHD to life.   

This is a brand new design for us which utilizes a lot of offset like our Eclipse Chain Ring but accomplish it with a more affordable one piece design.

On our test bike we were able to get to 32mph with incredible  torque compared to the stock ring where we got to 34mph (got there very slowly) so for a sacrifice of just a few mph in top speed you will get tons more torque. This chainring is perfect for offroad use. 

Because of its wicked tooth design the Eclipse clings to the chain and will keep the chain from falling off on even on full suspension bikes. Our test bike was a full suspension bike which had many issues with the chain falling off with the stock steel Bafang chain ring but this ring we had no problems despite its small size and long teeth. 

This chainring was reviewed very favorably by Karl from (review here) for singletrack riding with a BBSHD.


Support notes

This chain ring unlike our standard Eclipse chainring only has a very mild offset so it does not do much to correct the chain line of the BBSHD. The same is true of all chainrings smaller than 42T as they cannot wrap around the secondary reduction housing.
Unless you have a fatbike you will likely want to use an IGH or rework the cassette in order to have a good chainline through all gears when using this chainring, otherwise you may have shifting problems in lowest gears.

See our Knowledge Base for a comparison of this chainring's offset compared to others

See this link for our documentation on reworking the rear cassette.

For single speeds we strongly recommend this to be used with a derailleur type chain tensioner. If you don't use a chain tensioner and the chain does come off you risk bending the ring when you put it back on. If the chain comes off put the front chainring on first then put the chain over the top of the rear cog and slowly roll the bike backwards. Stop pushing if there is too much resistance. If you put the cog on first and then try to put it on the front ring it will bend or break the teeth and your chainring will not work right anymore.

Note: This is usable with BBSHD only. For BBS02 chainrings see the BBS02 parts section




3 Reviews

Cameron Aug 12th 2018

Luna 36 tooth

Very slick chainring. I also have the eclipse and mighty mini, but I prefer the gearing on this one . It gives a bit of offset, but nothing like the eclipse. With this ring installed without any spacers, it rides right in the center of my cassette which is perfect. I don't take much of a hit on the top end, but I suppose everyone has different preferences. The mighty mini 30 tooth doesn't mesh very well with my bike because there is zero offset, and I can't reach my lowest gears.
My top speed on flat ground (full throttle, pedaling hard) is about 60km/hr on a downhill mountain bike with knobby tires. For my type of riding, I prefer the torque over top end. It's hard to keep the front wheel down in the low gears when you goose this thing.
Build quality is top notch. I did manage to catch my sock in the teeth and it derailed the chain in between the motor housing and the chainring. I thought I had bent the ring forsure, but the aluminum has a great hardened temper and it sprung back to shape when I managed to pry the chain free.
Must have.

Chris LeClair Apr 10th 2018

Excellent replacement for stock Bafang ugliness.

This chainring was right for me in many ways. The stock BBSHD chainring is ugly, heavy and just too big for trail riding. 36 teeth was just about perfect for trail riding and cruising around town on my 29er but is just a tad slow for top speed on my 14t rear cog. With a 26" rear wheel I would recommend a larger one such as the Luna Eclipse @42t for off and 46t for on road but as always, it's really about personal preference. The chainring uses a narrow-wide approach for anti-chain jump and the teeth are quite long to keep the chain where it should be. Really pretty compared to the stock ring too! Remember to place the wide links on the wider teeth. Side note: Be careful when wearing pants while riding with a mid drive. Getting your pants caught in the teeth can be ankle-breakingly disastrous!

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