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  1. Sturmey

    Dishing, centering of wheel and drop out widening

    It depends on many factors and especially the weight of the rider. I think the spec of your hub has approx 42mm flanges and already 5.5mm offset. Increasing the dish/offset by even 1.5mm to 7mm total results in a rim offset relative to flanges of 14mm and 28mm approx and this results in a...
  2. Sturmey

    Dishing, centering of wheel and drop out widening

    Reducing the dish (moving the rim more over to the non drive side by loosening the drive side spokes/tightening the non drive spokes) makes the wheel more symmetrical and hence stronger. I always try to reduce the dish on rear wheels if possible. I would center the wheel if it reduces the dish...
  3. Sturmey

    Rear Wheel - Spokes

    When you remove the tube, with the valve hole downwards, the nipples can be shaken down and poked out.
  4. Sturmey

    Yose power conversion kit

    Perhaps post a photo. Sheldon Brown below explains the difference between 'freewheel' with 'cassette'. https://www.sheldonbrown.com/free-k7.html
  5. Sturmey

    TSDZ2– No overheating for me

    One thing I notice and think is well worth considering is the cadence of the rider. If the cadence (and therefore the motor) can be kept spinning fast enough (>70 rpm), the motor seems to stay cool. PS. re the magnets, the motor is an 'inrunner' in that the rotating magnets are enclosed inside...
  6. Sturmey

    Front hub conversion on vintage delivery bike. Battery suggestions and best motor query

    I agree 100% here. In particular, with old rusty frames, the seat post can be rusted into the seat tube, similarly handlebars quill rusted into forks, bottom bracket bearing shells rusted etc. Get these sorted (if necessary) first.
  7. Sturmey

    250W 36V basic speed numbers

    Re 'Gribble' and 'watts', dont forget that the function of the electric motor is to convert the electric power (watts = volts x amps) input into mechanical power output (watts =Torque x RPM x 0.104 ). And of course they both are not the same in that many electrical watts can be lost in heat. So...
  8. Sturmey

    250W 36V basic speed numbers

    You need to understand the difference/relationship between power, torque and rpm.. Its the magnetic field of the current (amps) that produce the torque. Its the voltage (emf/ electric motive force) thats necessary to push the current through the motor coils (and overcomes the back emf which...
  9. Sturmey

    Anyone bought off Bangood?

    The Bafang BBS02 750W/48V can be got cheaper or you could buy from UK supplier with hopefully some technical backup. I dont know what the difference is between the two models. (g340 vs BBS02B)
  10. Sturmey

    Crossfire Rear Rim

    Hi. You may have over-tightened that spoke at some stage. If you need to overtighten a spoke to true a wheel, you need to stop and loosen the adjacent two spokes a little. I once fitted an M5 washer under the (13g) nipple in a similar situation and it worked. This was tricky because the rim was...
  11. Sturmey

    Loose crank bolt

    Left hand pedal normally has left hand thread as explained below. https://blog.everydayscientist.com/?p=2655
  12. Sturmey

    Using the ebike battery in a power cut

    Something like this...
  13. Sturmey

    MXUS xf07 270rmp general discussion & info

    Some quick photos. The 'C' cover over the pas unit is homemade.
  14. Sturmey

    PSWPOWER - DO NOT USE THEM

    My kit came ready to go set up for 'torque' control, 26 inch wheel, km and no speed restrictions. Under normal conditions, I usually use either pas level 3 or 4, with the occasional burst of throttle when required. You can (for example) set c5 to 9 to reduce the controller current by approx 10%...
  15. Sturmey

    PSWPOWER - DO NOT USE THEM

    Hi. I bought the front 26 inch wheel version and fitted to bike with 'budget' steel front suspension forks. My intended use is for a winter bike/hack as I live very close to many off road trails. I have tested and clocked up about 200km so far. (I also have other bikes) Works perfect but the...
  16. Sturmey

    Tongsheng crank wobble - can I use Loctite?

    I think yours is a different problem in that in your case it appears to be just the crank arm coming loose on the spindle. The solution then would be to just replace the left side crank arm . I think the relatively common standard square taper(170mm ?) crank arm will fit so it should be easy...
  17. Sturmey

    Can anyone see from this video why the back wheel is doing this? Tar

    Just a thought......I wonder have you a phase failure.....This often causes the motor to shudder and reduces power by 66%. On a direct drive, pushing the wheel forward often causes the wheel to turn at reduced power but with a geared motor, this will only work in the reverse direction due to...
  18. Sturmey

    PSWPOWER - DO NOT USE THEM

    Just bought a xf07 front wheel hub kit from them. Absolutely no problems. Took a week to deliver. Has a kt dual voltage 36/48 controller, Lcd5 and 270 rpm (at 36v) motor. Cost me 186 euro. No delivery or customs charges (to Ireland in my case). Would be very fast at 48v (40km/hr) but I am...
  19. Sturmey

    Yose kit

    Hi. Anyone know the rpm of the newer yose 250w kits? I am in a position at the moment that I have both a 2-3 year old yose 250 front wheel (700c)and an xf07 side by side and am comparing both. Both wheel hub motors actually look identical with identical patterns. The only noticeable difference...
  20. Sturmey

    Carrera Vengeance Mk1 Bafang Hub

    Hi. I think this situation has similarities to the Pendleton upgrade. I think if you change the display and controller to for example the kt version, you may also need to change the 3 in 1 signal cable for a 4 in 1 to (as well as possibly brake levers) as I think the '790' has a different...