Shift Kit Questions Before I get started

Discussion in 'Transmission / Drivetrain' started by lhaake0408, Feb 18, 2014.

  1. lhaake0408

    lhaake0408 New Member

    I have a couple of questions about the shift kit. I plan on building a motorized bike and I have a bike with a proper sized/shaped frame, and the frame is very strong and sturdy. I want my motorized bike to have a shift kit, but the bike I have currently have, has no shifting gear system. What do I need to purchase to make my motorized bike shiftable? I plan on purchasing a shift kit from I looked into a NuVinchi hub but I'm not sure how it works, and also it looks a little pricey. Can someone please help me?

  2. Fabian

    Fabian Well-Known Member

    The Nuvinci hub is a brilliant system (and in my opinion the best system out there) but it can't take the stress of a motorized application; blowing itself to pieces; puking grease for 50 yards in every direction.

    To make your bike "shiftable", you will need a rear wheel that's designed to accept an 8 speed cassette, then you will need an appropriate derailleur, like a SRAM X5 and a proper shifting mechanism like a SRAM X7 grip shift; mounted on the left hand side of the handle bars.

    Depending if you are climbing steep hills or pulling heavy loads, you will need to set up the freewheel bearing with a dual range sprocket arrangement, operated by the front derailleur.

    My advise is to get the Deluxe shift kit which contains the White Industries heavy duty freewheel bearing. The standard freewheel bearing isn't worth a crumpet, nor would i even use it as a fishing weight.
    The Deluxe kit works out to be an economical investment because it gives you a lot of stuff for your money, and you get quality upgrades, and it contains many useful and essential tools for servicing and maintaining your bike.
    Last edited: Feb 18, 2014
  3. lhaake0408

    lhaake0408 New Member

    Thanks for getting back to me so soon Fabian, do you know of any websites that sell high quality 8 speed cassette, high quality derailleur and high quality shifting mechanisms.
  4. butterbean

    butterbean Well-Known Member

    You can also use an internally geared hub, which most often contains a coaster brake and never requires a derailleur. You must be very careful to never shift under power when using an internally geared hub, or the planetary gears inside will grind themselves to pieces. You will want to do some research on which internally geared hub can take the stress, there are some who have used them and can recommend one. Ask forum member kcvale, I'm sure he can recommend something. You will also want to make sure you maintain it very well, servicing the hub every 300 to 500 miles. It may be a little pricey and possibly even more costly than a freewheel cassette, but you won't have to spread the frame. A beach cruiser frame may not be able to accept a cassette without spreading. But it should accept an internally geared hub no problem.
  5. lhaake0408

    lhaake0408 New Member

    ThankYou!-1 more Question

    Thanks for the advice. Does anybody know of a particular mountain bike manufacturer/model that is very strong and sturdy and perfect for engine/shift kit?
  6. butterbean

    butterbean Well-Known Member

    For what you will spend on another bike, you can get an internally geared hub and have a less complicated setup. Your choice. I can't recommend a mountain bike, though. I'm cruiser all the way.
  7. FurryOnTheInside

    FurryOnTheInside Well-Known Member

    What's your price limit for a frame? What type of riding will you do? Jumps? Very rocky off-road terrain, footpaths, up and down stairs, or somewhat prepared mountainbike tracks?
    You need something around 19" nominal frame size I believe.. 17" high gap inside the frame if you go for mid-mounted engine.

    I don't have a MAB I'm just suggesting ways to make your question more specific and maybe get a better more specific answer.

    For what it's worth I'm saving-up for a planned build with a Surly Disc Trucker (700C version) which is a 4130 Cro-moly "fully loaded touring" frame, + Marzocchi mtb (4" travel) suspension fork that I already have, + Halo SAS (26") wheelset; for mainly asphalt riding.
  8. Barry

    Barry Member

    I built "Blackjack" early last year with the Nuvici 3 speed hub but, I only had about 80 miles on it before it was stolen. I'm gathering parts right now to build another very similar to it " The Blueberry" (including a good chain and lock) and will keep you posted as to the longevity.
    The Blueberry.jpg
  9. Fabian

    Fabian Well-Known Member

    If you are going to purchase a shift kit, you might as well get the other items from SickBikeParts:

    My personal preference is the 1:1 ratio SRAM X7 Grip Shifter over the MRX Grip Shifter. Make sure you order the "8 speed" version, because a lot of places have the default setting listed as 9 speed.

    My rear derailleur preference is a 1:1 ratio SRAM X5 long cage, designed to take up larger levels of chain slack, and it gives you the option of using a dual range front chainring setup, for serious hill climbing ability or serious pulling power should you tow heavy loads.
  10. Fabian

    Fabian Well-Known Member

    My only advise is to get a base model bike with front suspension as well as front and rear disk brakes, then upgrade the front disk to a Hayes 9" disk rotor and Avid BB7 caliper.

    Ensuring that the bike stops safely and rapidly is far more important than making it go.