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    #31
    Now is when you find out she has a secret you tube channel where she goes to the skate and mountain bike parks and rides like Sam Pilgrim.

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    #32
    I wouldn't overthink this, if nothing is mechanically wrong, and she's dropping chains, get some sort of chainguide on there and then forget about it.

    You don't have to be on a mountain bike ripping rough terrain at speed to need a chainguide, as mountain bikes have suspension, and even cheap mountain bike derailleurs have clutches to reduce how much the chain bounces around. Both of those things are quite effective. I ride mountain bikes, and also have an e-cargo bike for around town, and it was more common for me to drop the chain on the e-cargo bike than mountain bike, when neither had a chainguide.

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      #33
      I agree that is what I shall probably do. It's just annoying that a brand new bike needs modified in order to use it as intended.

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        #34
        Guess you could always try to strap a go-pro to the bike - looking down at the chain. It's possible some eagle-eyed members here could spot a problem. Or if nothing else, possibly a slow-mo replay could spot the first instance where things get messed up and help with troubleshooting.

        One other possibility occurred to me as someone mentioned clothing above. Not so much that specifically - but I know my 'natural' foot position has my heel pointed in slightly - to the point it sometimes brushes the frame. Any possibility you wife has an excessive 'heel in' stance, too? Possibly the very edge of a shoe is clipping the chain and knocking it off? Maybe a 'sneaker check' to look for signs of chain grease on the inside heel area?

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          #35
          1-2mm bend in the chain ring is plenty enough to throw chains if it's abrupt - if it's gentle it's not so likely to be an issue

          FWIW I've seen more than a couple of new bikes that had a tendency to drop chains, even some with expensive derailleurs... but everyone was fixable one way or another and I'm convinced the first place to start is narrow-wide... I've got one bike with a high-end clutch derailleur, skinny chain (11sp) and good chain line that would drop them not terribly often with skinny tooth rings, just every few rides, and *never* happens on narrow-wides (many 1000's of miles).

          I've got another bike with a cheap 7sp derailleur that unlike the other bike, even completely new out of the box, would drop chains annoyingly often, every ride or two. It would usually happen when shifting rapidly. It had a not terribly good chain line, narrow tooth ring and would always drop on the same side and way too often get hung up in the cadence sensor. Fabricating a guide helped a lot bought had it's own share of issues and I would still get that very seldom drop but it was a pain getting the chain back on since guides not only block the chain from coming off they also block it from going back on. Narrow-wide and modified guards on both sides of the ring and never again had one drop - added benefit since it's mostly a loaner is the guard goes a very long way to keeping pant legs out of the chain.

          And rider technique sounds like BS to me... you should be able to ride downright abusively and not throw chains, pedaling under tension (bad idea for other reasons), fast shifts (ideally shouldn't be an issue but if things are less than optimal can lead to drops), etc. although I would see if I could correlate the chain drops to any riding behaviors

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          • Retrorockit
            Retrorockit
            Giga Member
            Retrorockit commented
            Editing a comment
            Narrow/wide is pretty much what makes 1x drivetrains possible. Chain guides are old school when N/W isn't an option.They both work.

          #36
          I'm adding these comments on chain retention from another currently running thread that touches on some elements I've discovered on these ebikes. I am running a Luna Eclipse narrow/wide 42T chainring in this case. Some of this won't apply to OP's issues, but it speaks a bit to chain retention.

          Retro, on your DH rated derailleur comment, I was under the impression when I started this emtb journey that I would require a clutched derailleur and much heavier duty drivetrain components all around. On my SC Nomad/BBSHD I installed a 9-speed Box 3 whole setup...11-50 all steel cassette, clutched derailleur, trigger shifter, and chain. Last month I destroyed the derailleur...just from use/abuse, no impacts. Wanting to continue riding until I ordered a replacement I installed my old, previous, Shimano, 9-speed steel, 11-34 cassette, long cage SRAM X-7 rear derailleur, and X-7 trigger shifter. Before ordering new parts I thought I'd give this setup a try. On the very first ride I was impressed with the increased smoothness over the previous drivetrain. I also discovered that I really didn't need 11-50 gears. On our roughest, rocky climbs, the 11-34 was more than adequate, and when going to the 34T I could crawl over obstacles with ease and control. I never used the 50T on the Box cassette, and I don't think I even used the next cog that was 44T or 46T. I couldn't go slow enough to use the 50T. It was practically unusable for me.

          Next, on the lack of a clutch derailleur, I haven't dropped the chain even once on fast, rocky descents. This suprised me a bit. My used X-7 stuff is working perfectly. I'm a decent MTB'er and even with the back end of the bike...6.5" on my Nomad...hammering through rocks, jumps, and V-dips, the chain stays in place without even a bunch of racket back there. And my chain is longer than I'd normally run it because I didn't want to shorten it, thinking I'd go back to the 11-50 setup. So my chain nearly touches the derailleur when in the 11T. This is often bad juju for chain flail in rough terrain. I am surprised. I will not be going back to a clutched derailleur or massively low gears. I just don't need them. And, I'm not lugging the motor in a high gear abusive manner running this 11-34 cassette. Now...this chain and derailleur control may be an issue on other rear suspension designs that have more radical axle paths that work the chain like a rubber band. The VPP on SC bikes is kind of known for being easy on this issue.

          I'm retired from my past career and only work part time hours at a bike shop so I get to ride a lot...sometimes 3 days in a row and usually at least every other day. I'm learning more and more about the BBSHD and how it works as an emtb conversion. Right now I couldn't be happier.

          Comment


          • Retrorockit
            Retrorockit
            Giga Member
            Retrorockit commented
            Editing a comment
            My bike is a mid 2000s 8 speed. No clutch or other special setup. Just a shorter cage MTB derailer. I'm also running a 50t ring, so 40T is not that low for me. Someone else will need to give him advice on newer stuff. This is a fast 26" street bike.

          #37
          Sorry for the long delay in further updates but it's taken this long to get the dealer/manufacturer to sort something out.

          Rest of story so far:
          Dealer agreed chainring was bent but said it wasn't bent enough to cause an issue. Said he would contact manufacturer for guidence.
          Waited 2 weeks and nothing so contacted manufacturer myself. Manufacturer said he would speak to dealer.
          Asked to take bike back to dealer which I did as they wanted to check everything was adjusted correctly. They said it was but before giving bike back to me the chain came of for the dealer whilst testing which finally proved my point. Dealer said he would get new chainring from manufacturer.
          Heard nothing for one week so contacted manufacturer again and they said that delivery of a new chainring would take until end of November at earliest. I said this was not acceptable for a new bike and that they must have a chainring even if they had to take it of another new bike.
          Manufacturer said to wait - I did some more getting angry at them and they agreed dealer could fit a different make of chainring to the bike and manufacturer would pay.
          Dealer couldn't find a 38T chainring with direct mount for Bosch motor and I would likely have to wait.
          I found a spider adapter with correct offset for mounting to Bosch motor and a 104BCD NW chainring to fit within 10 minutes of googling. Gave dealer and manufacturer links to said spider and chainring.
          They agreed to buy and fit them which was done yesterday. So now brand new narrow wide chainring (I found plenty of standard chainrings to buy but decided to follow the advice given here about narrow wide chainrings and didn't give dealer or manufacturer links to those chainrings in the hope they would buy the more expensive narrow wide chainring which they did) fitted and so far so good - although it has only been one day. However, I can see with side pressure on the chain it will take a lot more sideways movement for it to drop the chain so I am finally hopeful the problem has been resolved.

          Comment


          • Retrorockit
            Retrorockit
            Giga Member
            Retrorockit commented
            Editing a comment
            It probably should have had that in the first place. It's kind of how 1x drives work. Except for my own cross chained lashup of course.

          • hoggdoc
            hoggdoc commented
            Editing a comment
            I'm seeing more and more comments about local dealers being nearly as bad as the offshore manufactures when it comes to fixing problems on their bikes they sell. Considering the extra money one was paid to deal with a local dealer I'm not sure I will ever do that.

          • AZguy
            AZguy
            Giga Member
            AZguy commented
            Editing a comment
            I've got a local shop I refer people to and they've been outstanding - I've tipped a beer or three with the owner in the past so have a good vibe on his attitude

            OTOH I do all my own wrenching because it's so ridiculously easy compared to motos (I did all my own moto wrenching for decades) and I've got pretty much all the tools needed... if I needed something I didn't have would just get it vs. taking it to the shop...

          #38
          Originally posted by Hunda67 View Post
          I'll have a look into it but since the bike is new and not cheap I would expect the manufacturer to fit such a thing.
          Not a good assumption in this day and age, price is often associated with marketing and brand and can have little to do with quality I am afraid. Just try and find a hi-end quality kettle for the kitchen, impossible! I'm going to go look in the commercial sector next.

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            #39
            Well thats a full week and 150 miles covered and no chain drop yet.

            Comment


            • AZguy
              AZguy
              Giga Member
              AZguy commented
              Editing a comment
              Sounds better at least - now time to put some miles on it and really test it out!

              When chains are dropping the chain ring is the first place to work on things and a bent narrow-only ring sure seems like a good thing to move away from...

            • Retrorockit
              Retrorockit
              Giga Member
              Retrorockit commented
              Editing a comment
              Lube it regularly. If the chain can slide down into position you should be good. if it sticks to the tooth then problems can start.On my cross chained setup it's the difference between success and failure.

            #40
            So many new brands on the market since the e-bike revolution started, Bergamont is an established German manufacturer that went international some years back (I read) but that doesn't mean it's quality though it no doubt is. I'm steering well clear of all these factory e-bikes until they get all the bugs out and clear winners emerge. Months and months delays waiting for proprietary parts is unacceptable.

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              #41
              I agree with the difficulty in getting parts - I don't know if it's a UK thing or is an issue elsewhere.

              It's my wifes bike but I do the cleaning and lubing. But I clean and lube the chain regularly - at least once a week so hopefully it's seldom out without a well oiled chain.

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              • huffnpuff
                huffnpuff
                Newbie
                huffnpuff commented
                Editing a comment
                Yes ncmired we have a 250W limit here for road use, which is where 99% of them get used probably. If it's specifically for Aus use it will be of that caliber.

              • Retrorockit
                Retrorockit
                Giga Member
                Retrorockit commented
                Editing a comment
                Realistically I spend as much time as possible at about that level of assist. Riding into strong headwinds I use about twice that to keep riding the same speed. I really don't understand the obsession with Ebike power limits.Many people really could use more power to ride normal speeds.

              • hoggdoc
                hoggdoc commented
                Editing a comment
                Trust me it's the same everywhere. Has more to do with the Chinese manufacturers not stepping up their game some would say maybe on purpose. Then you have the rent is prices they're charging for containers to ship from China to the US now. It's a mess.

              #42
              Just of two weeks and several hundred miles and no chain drops :-)

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              #43
              Now a month with no chain drops. As you say $10 saved (which I wouldn't have noticed if they had added that to the cost of the bike when new) but one unhappy customer and possible lost future sales when someone asks me or the wife about our experiences with the bike.

              It's something I'll look at closely in the future if when we come to change our bikes again.

              Comment


              • AZguy
                AZguy
                Giga Member
                AZguy commented
                Editing a comment
                Awesome! A good narrow-wide is best first defense to drops and solves it often

                Honestly though, dealer suggesting a bent ring won't increase chain drops seems silly to me

              • Retrorockit
                Retrorockit
                Giga Member
                Retrorockit commented
                Editing a comment
                $10 x 50,00 bikes is what they're looking at. It's not "all about you". In fact it's not about you at all. The bike was designed by accountants.
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