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by MadRhino
Mar 31 2021 3:17pm
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 111
Views: 3237

Re: 27.5” front 26” rear - Wheelbuilding

LARGER wheel diameter especially ...Well also helps a little with the top speed Not really. I mean, when the fastest top speed is the priority, the larger wheel won’t do it because of the higher leverage that requires more power and makes lower efficiency. When you want to exploit the fastest possi...
by MadRhino
Mar 31 2021 10:58am
Forum: EBike General Discussion
Topic: First build and battery seems to die too quick.
Replies: 43
Views: 1462

Re: First build and battery seems to die too quick.

Yep. So far battery technology had not succeeded to combine long life with high density. Long life batteries are heavier and bigger, while very high energy density batteries can be worn out very quickly. That is a compromise that one need to make, wether building priority is performance or durabilit...
by MadRhino
Mar 31 2021 10:18am
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 111
Views: 3237

Re: 27.5” front 26” rear - Wheelbuilding

I'm running a MXUS 3KW TURBO 3t on my bike and love it, there is quite a difference in top end between the different winding variants of the MXUS. I'm running 24" on SAS halo rim and the acceleration is phenomenal. Wider rim on the back vs the front but both 24 inch. Smaller the better rim imo...
by MadRhino
Mar 30 2021 5:20pm
Forum: EBike General Discussion
Topic: Where to find brushed hub motors nowadays?
Replies: 12
Views: 484

Re: Where to find brushed hub motors nowadays?

Brushless electric motors are running cooler, and silent. They can be fed much more power than their rated spec. There is a large variety, cheap and easy to get. I can't see why one would want to go back to brushed motors for building a vehicle, other than the need for very large motors that would h...
by MadRhino
Mar 30 2021 5:09pm
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 111
Views: 3237

Re: 27.5” front 26” rear wheel

I use brass or alu washers on the motor flange, stainless in the rim. My favorite spoke prep is double boiled linseed oil, the one that is sold for wood finishing. Blue locktite or other mild thread prep are doing good but much more expansive.
by MadRhino
Mar 30 2021 11:50am
Forum: EBike General Discussion
Topic: Where to find brushed hub motors nowadays?
Replies: 12
Views: 484

Re: Where to find brushed hub motors nowadays?

High speed with plastic kid’s cars is not a good idea IMO, but as long as this choice is about your own skin and bones, I have nothing against. :mrgreen:
by MadRhino
Mar 30 2021 8:42am
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 111
Views: 3237

Re: 27.5” front 26” rear wheel

... Now with alternating “in and out” it seems that you wouldn’t be able to get the tension ratio as close, is that correct? It doesn’t change a thing for spoke tension. The purpose of alternate lacing is to limit the spokes rubbing, or even bending at the cross. Yet, with hub motor flanges that ar...
by MadRhino
Mar 29 2021 3:20pm
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 111
Views: 3237

Re: 27.5” front 26” rear wheel

When possible we lace single cross alternate motorcycle pattern. One spoke out, the next inside of the flange and crossing under the previous. That is best and most common, but there are some good reasons to lace different: dishing, rim width, spoke J-bend angle...
by MadRhino
Mar 27 2021 12:32pm
Forum: EBike General Discussion
Topic: Question
Replies: 24
Views: 726

Re: Replaced throttle and now doesn't work :( Cycle analyst

alexplatts18 wrote:
Mar 27 2021 10:08am
...The cable connection is exactly the same as the Last throttle aswell.
Any help would be appreciated!
Obviously it isn’t. I mean, it could have the same wire colors and still be connected differently inside. Shutting off the CA screen when plugged is something to worry about about a short.
by MadRhino
Mar 23 2021 1:34pm
Forum: EBike General Discussion
Topic: First build and battery seems to die too quick.
Replies: 43
Views: 1462

Re: First build and battery seems to die too quick.

Good batteries are never cheap. Those dreaming of a cheap battery for their ebike, are the target victims for the crooks. Lots of components can be found very cheap and let you build a good ebike, but the battery is not one of them.
by MadRhino
Mar 23 2021 10:00am
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 111
Views: 3237

Re: 27.5” front 26” rear wheel

DT Swiss and Sapim bicycle size spokes are available locally almost everywhere. Why buying online and wait, with the risk of errors or fraud that would require shipping back? Pay a little more, get them quick and cut to length. The few times I purchased spokes online was for big orders, quantities t...
by MadRhino
Mar 22 2021 9:04am
Forum: EBike General Discussion
Topic: Does more wattage gives more initial torque or only more speed
Replies: 17
Views: 717

Re: Does more wattage gives more initial toque or only more speed

For hard acceleration, the bike need to have proper geometry. 10kw hard start on a bike that is not built for this, is almost impossible to control. Then the rider has to temper the acceleration to make it progressive, or set a soft start controller. But, if you build the bike with adequate geometry...
by MadRhino
Mar 21 2021 6:35pm
Forum: EBike General Discussion
Topic: Does more wattage gives more initial torque or only more speed
Replies: 17
Views: 717

Re: Does more wattage gives more initial toque or only more speed

Watts are power, volts are speed. More power won’t make any extra speed, unless the initial power was too low to achieve voltage speed. More power and gearing down are making more torque. With a DD hub motor wheel, gearing down does mean a smaller wheel. A QS 273 can be fed much higher power than 80...
by MadRhino
Mar 18 2021 11:05pm
Forum: EBike General Discussion
Topic: QS205 tolerence specs??
Replies: 16
Views: 490

Re: QS205 tolerence specs??

Yep. Turnigy wires are high strand count silver tinned copper, silicon insulated.
by MadRhino
Mar 18 2021 11:23am
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 111
Views: 3237

Re: 27.5” front 26” rear wheel

That little difference doesn’t matter much. You will probably want it even slacker anyway, depending of speed and riding style. I adjust geometry with the custom dropouts that I make for any hub build. Bolt-on dropouts can be adjustable with multiple mounting options, letting you use almost any whee...
by MadRhino
Mar 18 2021 9:21am
Forum: EBike General Discussion
Topic: QS205 tolerence specs??
Replies: 16
Views: 490

Re: QS205 tolerence specs??

No solder required when crimped of course. Best wires are silver tinned copper, same for the connectors.
by MadRhino
Mar 18 2021 3:43am
Forum: EBike General Discussion
Topic: QS205 tolerence specs??
Replies: 16
Views: 490

Re: QS205 tolerence specs??

A variety of butt connectors are normally available locally. Best are tinned copper marine grade.
by MadRhino
Mar 17 2021 12:16am
Forum: EBike General Discussion
Topic: The Odd Duck
Replies: 4
Views: 280

Re: The Odd Duck

Stupid design that is unlikely to last very long. The small rear wheel would be ideal for a hub if a Penny farthing style is the goal. Then, to make it ideal, the front wheel could be laced on a planetary freewheel crank hub, if such can be found or made reasonably.
by MadRhino
Mar 16 2021 11:58pm
Forum: EBike General Discussion
Topic: QS205 tolerence specs??
Replies: 16
Views: 490

Re: QS205 tolerence specs??

Of course, they are soldered on the cells tabs with a machine. You can’t weld a new wire there if you don’t have that machine, or some expertise that I didn’t manage to find. Best is to crimp butt connectors on the actual wires, or use big gold bullets 5.5mm and up if you need the harness to be easi...
by MadRhino
Mar 16 2021 8:53pm
Forum: EBike General Discussion
Topic: QS205 tolerence specs??
Replies: 16
Views: 490

Re: QS205 tolerence specs??

The very short 10ga wires are not a problem. Crimping high quality butt connectors and wiring the harness with 8ga is a must because it does require longer wires. The longer the wiring, the bigger the wire ga required. Feeding that high power does heat the wiring pretty quick, so the longer the time...
by MadRhino
Mar 16 2021 12:35pm
Forum: EBike General Discussion
Topic: Stop-a-flat tubes
Replies: 19
Views: 668

Re: Stop-a-flat tubes

Tannus inserts are popular here and sold in many local bike shops because they are cheaper and don't require going tubeless. Cush Core and Tannus are very different foam insert systems. Tannus is lining the tire and use a smaller tube on the rim, Cush Core is lining the rim and the tire is tubeless....
by MadRhino
Mar 16 2021 10:19am
Forum: EBike General Discussion
Topic: QS205 tolerence specs??
Replies: 16
Views: 490

Re: QS205 tolerence specs??

I use 8 ga turnigy and the wiring gets pretty hot sometimes.
by MadRhino
Mar 15 2021 3:48pm
Forum: EBike General Discussion
Topic: QS205 tolerence specs??
Replies: 16
Views: 490

Re: QS205 tolerence specs??

Yep. 10 ga wires are too small for that kind of power. 8 ga is OK if they are short length.
by MadRhino
Mar 15 2021 1:59am
Forum: EBike General Discussion
Topic: QS205 tolerence specs??
Replies: 16
Views: 490

Re: QS205 tolerence specs??

The risk is only at low speed uphill, repeated hard acceleration. Riding high speed is not a problem for it won’t pull much power after it had reached it. Hard starts from a standstill are pulling lots of power but it is only a few seconds and safe as long as it is not up a steep hill. This motor ca...
by MadRhino
Mar 15 2021 12:27am
Forum: EBike General Discussion
Topic: Stop-a-flat tubes
Replies: 19
Views: 668

Re: Stop-a-flat tubes

Very good tubeless kits are available for common mtb racing tire sizes. Foam insert, tubeless valve and sealant in a kit ready to mount. Look for Cush Core, my favorite. They won’t guarantee absolute flat proofing, but you will be able to complete the ride home even in the worst case scenario. Most ...