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Advice needed : bbso2 chain keeps coming off!

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  • Advice needed : bbso2 chain keeps coming off!

    Hi, so I set up a bbso2 on an oryx equipe 4500 for a commuting bike, it works great, tackles all the hills I've taken it up. Only annoying issue I have is that the chain comes off the chainring like 3 times each ride! I have a 48t stock bbso2 chain Ring. I want advice on the best way to put an end to this. I've read that this seems to be quite a common problem amongst bbso2 owners. Seems like a bling ring is a real good solution... I was wondering about chain guides, can anyone tell me best one for this application or at least what to look for if buying one for this application. I am also considering upgrading my drive train to an alfine igh 8 speed. And was wondering if the bling ring is compatible with such a set up. Thanks!

  • #2
    I never tried the stock ring,went straight to the Bing one because lots of people complained about chain issues. In about 600 miles, not once has the chain come off on my build.

    Provided your chain is not too slack, and it is not falling off due to the rear derailed bein poorly setup, and your chain is not worn, I'd say try the Lekkie Bling. Do check the offset would work for your setup - all these rings have different offsets, which might change your chain line.

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    • Zippy
      Zippy commented
      Editing a comment
      I have a 42T Luna Ring on the longtail cargo bike and a 42T Bling Ring on the off-road bike, not a single dropped chain on either cycle at any point and that includes some hard bum shifting at inopportune times on my part in many cases. Chainline is pretty darned good on both bikes.

  • #3
    I dropped the chain a few times when the chain line was not straight. New derailleur with clutch made a big difference, and bling ring even better because of its narrow wide profile and improved chain line. Alfine 8 works great with bling ring. It might be OK with stock chainring depending on chain line.

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    • #4
      If you are set up with IGH or single rear gear, stock chain ring will probably be fine. If you drop the chain and you use a derailleur, then lekkie should solve the problem for good.

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      • #5
        Ha! Just went through that yesterday. the first time ( this is my 4 th. Bafang type build 2HD's and 2 02's) I used the stock 48T chain ring that came with it. I only did so as I wanted to avoid doing the math to calculate my needed chain ring size, so just figured I'd take a guess at it and ride it THEN order the proper 38T Race Face chain ring, along with the required adapter, Luna shipped it today I'm told. I didn't realize until using the stock ring, and having the chain fall off within a mile, how well my other Race Face ones were doing their job of keeping the chain on. The new stock ring is now in the steel recycle barrel, along with the other 3.

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        • #6
          Yeah, stock steel chain rings don't provide very aggressive teeth. Of course, chain line issues can/will make it worse. The most IMPORTANT item to carry IMO would be some gloves (I keep Nitrile handy) and/or good rag. Sucks to hop a chain and must grab it with bare hands. I've improvised using trash paper products but that's not fun or much cleaner.

          I find the Luna aluminum chain ring adapter with 42T works a treat with BBSHD on fatty. I would like to try 40T and it looks like 40T will still clear the motor housing?

          Get a chain wear gauge and use it. I'm finding noticeable (not alarming) chain wear around 1000 mile mark. Further, any ride where you may be greatly inconvenienced by chain breakage I suggest to carry a master link (or 2) and breaker tool along with those Nitrile gloves.

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          • #7
            I forgot to mention that on my three previous rides, I have never dropped a chain, not once! And my fat bike has a more wonked out chain line then then this new ride does, so yeah the proper chain ring makes all the difference.

            My new/used bike is a 27.5"r, so I was way over geared with a 48 t, even for what is going to be mostly a road bike. This will be my new build to carry in my crane as a dinghy.

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            • #8
              I'm having the same problem. I finished my build about a week ago. I went mountain biking today and I don't even remember how many times the chain came off. Maybe 6? Luckily I DID bring gloves! I'm going to order the Lekkie 42 and see if that solves my problem and gives me a couple more gears. I'll let you know what happens.

              Comment


              • Zippy
                Zippy commented
                Editing a comment
                Guessing you'll have fewer problems, the only time the chain has jumped on my old Trek FS bike is about a week ago I was coming down a hill on pavement, opened it up pretty good and was doing right at 30 mph. Hit a massive pothole hard and the chain flew off-I wasn't pedaling, it just levitated right off the ring. I didn't catch what happened for a minute, thought my motor got broke by the impact since it was spinning freely. The 42T Bling Ring has been so good the last thing I expected is my chain coming off.

                Worth the 80 or 90 bucks, whatever they cost currently.

            • #9
              I just got my 4 th build finished up, using the BBso2 on sale package this time. I took a brief ride with the stock BAFANG chain ring, and yeah, the chain came off. No biggie, as it gave me the info I needed to order a more properly geared RaceFace chain ring. With no other changes, my chain is staying where it should now, as simple as that. I still have yet to drop a chain ever on my two other rides, both having Lekkie chain rings.

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              • calfee20
                calfee20 commented
                Editing a comment
                Yep me to. Recently did a BBS02 on a Paratrooper because of you and I have had the chain come off a few times. I'm going to install an 8 spd Shimano Alfine though and that should fix the problem.

            • #10
              Hmm, I retrofitted BBS02 in July with the stock 48 steel chain ring and an 8-speed cassette on two different bikes. I did have the chain jump off a few times and decided to put the front derailler back on in a fixed position, just as chain guide. Works fine, no chain jumping off over a few 100 miles.
              Last edited by JerryBurks; 1 week ago.

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              • #11
                I have lost my chain off Luna Eclipse a few times; but was usually after jumping off a curb or similar.
                Today I had derailleur set screws unadjusted after replacing shift cable and I ran the chain off the first gear into the wheel.
                This caused the chain to come off chain ring and lodge between chain wheel and motor.
                Tore out a couple spokes, probably bent the cassette, and destroyed the chain.
                After making the fixes I noticed that my Eclipse chain ring is showing wear; so I came home and compared it to another I got for my next build, and sure enough it's pretty worn down on the back side of the teeth.

                Here's some images of the mess, the fix, and old chain ring versus new chain ring for comparison.
                I've got over 6000 miles on the chain ring; so it's not like it's anyone's fault - just normal wear imho.

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