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  1. xtinctionRebeller

    SJS Cycles - broken address checker & bad communication options

    Tried to place an order on SJS Cycles. Got this: The first error msg is bogus (I didn't reach the payment step yet). They seem to have a broken address verification tool. When it falsely rejects a valid address, there is no way to override and move forward. The only ways to reach them is...
  2. xtinctionRebeller

    only 12 motors for fat bikes & all are bad choices

    I've studied 11 mid-drive kits for fat bikes (listed here), as well as the Stokemonkey (which is unlisted due to being discontinued). I'll probably abandon the project because there are just no good options. Hacking budget-- It's sensible to nix anything over ~$1.5k because there are bikes...
  3. xtinctionRebeller

    where to buy L-Faster motors -- which are sold only on Aliexpress, and contact pg imposes reCAPTCHA

    What's the deal with L-Faster? I can't find these motors anywhere except their own Aliexpress store. I really doubt a manufacturer would be their own exclusive retailer, particularly when they're so bad at running a shop themselves. Their "online store" redirects to Aliexpress, and their...
  4. xtinctionRebeller

    Aliexpress blocks access to vendor licenses

    Aliexpress hides the business details that are needed for customers to see who they're actually dealing with. The only possible mechanism for identifying a merchant is the "business license" link: Clicking it gives this: Then sliding it to the right gives this broken mess: I refreshed and...
  5. xtinctionRebeller

    new wiki for basic specs on aftermarket mid-drive motors

    This wiki is a simple table to catalog all the possible mid-drive motors that can be fitted to muscle bikes (for e-bike conversion). The idea is to make it easy for novice builders to see the options laid out and quickly form a short-list. I did a lot of digging to get it in its current state...
  6. xtinctionRebeller

    How a mid-drive motor maker solves the uncentered frame about the pedals issue

    This is how one mid-drive producer (Binova Flow) solves the right-shifted pedal problem: Though it seems a bit bizarre that the right pedal extends out from the crank arm, probably giving it an unreasonable Q-factor. Bafang and Tongsheng leave the problem for users to deal with. Have any...
  7. xtinctionRebeller

    Why do 1/2" pedal taps exist?

    These are 1/2" taps for pedals: When a crank arm is stripped by a 1/2" pedal, it wouldn't make sense to retap it with a 1/2" tap tool again because the threaded material is missing. If I understand correctly, the socket must be tapped with a bigger tool (e.g. 9/16") to ensure there's enough...
  8. xtinctionRebeller

    Torquing the pedals on -- what special tool is needed?

    I have a bit of history of pedals coming loose while riding and getting stripped. The manual of my latest bike states (page 14) that the pedals need 37 +/-3 NM of torque. I'd like to get this right so I don't continue to have problems. How do you install pedals at a measured torque...
  9. xtinctionRebeller

    Ebird Store -- Amazon & Aliexpress only? That's hard to trust.

    Stuff I'm in the market for often appears in Aliexpress and Amazon from Ebird Store. Does anyone know if this shop has a proper website or brick & mortar store? The issue is that none of their products seem to have a warranty, which isn't even legal in the US & Europe. Perhaps they simply...
  10. xtinctionRebeller

    What are the crank & BB specs for Mongoose Vinson?

    I need to remove the cranks and bottom bracket on a Mongoose Vinson, and need to know in advance what tools I'll need. The Mongoose Vinson manual is useless. If someone has a Vinson, I'd appreciate if you could tell me what size hex/allen wrench is needed for the cranks (all mine are too...
  11. xtinctionRebeller

    Using power tool batteries (drill & string trimmer) to power a tsdz2 (48v motor)

    I would like to "underdrive" a 48v motor. Is it possible? The rationale is to use batteries that I have on-hand (so the up-front project cost is low). I'd rather not buy a 36v motor and then later get the urge to upgrade to a 48v motor. I know overdriving is a thing per this post: These...
  12. xtinctionRebeller

    Bafang & Tongsheng both have an 850c display. Are they the same? Interchangeable?

    I noticed Bafang has an 850c and it looks very much like the one I see sold with Tongsheng TSDZ2 motors. Are they the exact same, and therefore interchangeable with either motor? Or is this a clash of different products with the same model#? There is also a DPC-14 masquerading sometimes as an...
  13. xtinctionRebeller

    Miranda - broken site & problems ordering parts in the US

    mirandabikeparts.com shows a huge catalog of cranks in many different geometries. The problem is the website is broken beyond belief, and it's in Europe. Broken functionality: "add to cart" brings me to an empty cart "contact us" button on the product page does nothing.. no form appears...
  14. xtinctionRebeller

    (solved) Different kinds of square taper BBs: JIS, ISO -- which is TSDZ2? Data is conflicting

    I need to know what specs to look for when replacing a Tongsheng TSDZ2 crank. Everyone says "square taper" and stops there, but there are 3 2 different kinds of square taper: JIS = 12.65mm (compatible with Bafang) ISO = 12.33mm BNI = ? (compatible with Bosch e-bikes) The measurements above...
  15. xtinctionRebeller

    (solved) (Tongsheng) Left crank arm needs to be ~3mm longer than the right <= false

    The stock crank arms for the Tongsheng TSDZ2 have flawed geometry in 3 respects: The Q-factor is unusually large ~210-270mm, depending on who you ask and depending on the bottom bracket width. The offsets are asymetric due to the reduction gear, which puts the midpoint of the pedals to the...
  16. xtinctionRebeller

    Tongsheng crank arms are for riders of height 5'9" - where can we get smaller cranks?

    According to case studies, these are the optimum crank arm lengths given a rider's height: rider heightoptimal crank length (mm) 6’0" (1828mm)177.5 5’11" (1803mm)175 5’10" (1778mm)172.5 5’9" (1753mm)170 5’7" (1702mm)165 5’5" (1651mm)160 Most vendors don't state the length of the crank arms...
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