Thoughts on Internal Shifting Hub?

Discussion in 'Transmission / Drivetrain' started by LRSimons, Oct 12, 2016.

  1. LRSimons

    LRSimons New Member

    I've been running a shimano 8 speed hub on a setup I got a few months ago. I try and baby the thing, but I know at some point its going to blow up on me. I think that the higher speeds its forced to deal with would be the death of it before engine torque, but I could be wrong. Wouldn't mashing on the pedals put more torque through the drivetrain than a china girl? I know most upgrade car drivetrain parts are rated for torque- but some have horsepower ratings as well.

    Isn't the nuvinci rated for 7 horsepower? I wonder if a cvt style would be stronger or weaker than a planetary gears. The engine connected to my hub certainly isn't making 7. Id be happy with 3 lol.

    Has anyone been running one of these for a while? Reliability?

    Hope my ramblings make sense.


  2. panmines

    panmines Member

    I am glad that you ask this because I had a brand new 34t 8-speed cassette bend on me in its highest gear. Cog sets definitely have their limits.
  3. lazylightning@mail.r

    lazylightning@mail.r Active Member

    Hi! Are you guys running jack shaft kits that send power to the right side and through the bicycle chain and cogs? I'm thinking of trying a jackshaft setup. Did a cog on your 8 speed cassette bend or did the whole set of cogs go crooked? Maybe there are certain brands and makes of cogsets that are known to be better?
  4. panmines

    panmines Member

    Yes, my bike is jackshafted. It was only my largest 34t cog that bent and folded outward over the smaller ones. It was actually more of my fault because I took it up a super steep hill that I really shouldn't have and my bike being close to 100 lbs. probably didn't help it either . Interesting enough, I managed to bend it back straight with a pair of vice grips and you almost can't tell that it's bent. I do think the brand makes a difference because before this cassette (Sunlite brand), I was using a different wheel with a 7-speed Shimano mega range (14-34t) freewheel, and that thing lasted a long time and never faltered on me. Another thing I noticed is the 34t cog on the freewheel was more of a solid piece than the one on the cassette. One thing I know that would help prevent this is adding more space between the small and large chainrings in the chainset assembly. That way, the small chiainring will be closer to the center of the bike and hence more inline with your largest cog on the back wheel. Plus, spreading the two apart is something you generally want to do to avoid the chains from rubbing in your highest gear.

    A jackshaft is definitely worth the money and you shouldn't worry to much about destroying your rear cogset unless you are looking to gear it way down like I did.
  5. LRSimons

    LRSimons New Member

    I'm running a jackshaft- think it's the middle priced shifter kit. As many others have said before, the jackshaft is a huge upgrade and reduces compromise. However, it is expensive and with the ~$200 (and knowledge) you can build a single speed to the same top speed/acceleration. Heck, with 200 bucks you can have whatever pipe you want, a fred head if you're so inclined, jag cdi, maybe just scrap the china girl and put a engine actually made of hard aluminum on. But IMO, the shifter bike will always be more refined.

    panmines- Wondering about how your sprocket/ cogset broke as well. Was your gearing putting a ton of torque through the thing? Any teeth shear off, or just bent side to side?

    Edit- posted a couple of seconds after yours went up. Questions answered.

  6. panmines

    panmines Member

    I was a real bummer to. Had just bought it the day before. If I money was no issue, I would put this thing on it:
    It is a 11-48t 8-speed cassette made for e-mtb. It says in the description that it was made to handle the high amounts of torque of an electric crank motor. It is kind of cost prohibitive though. With this cassette, special derailleur and trigger shifter, the whole setup come out at $580 before tax.
  7. LRSimons

    LRSimons New Member

    Wow, that's expensive. Seems like the sprockets would be weak except for the largest and three smallest. Is it an electronic shifting setup? I remember seeing that on Top Gear, before Hammond stuffed it into railroad tracks.