Help! Best kit for hilly area for 16 stone and incredibly weak leg muscles

[Dali]

Just looking at options as this is a big purchase for me and I want to get it right.

Does anyone have views on this Akeima 100sx, please, as it seems a pretty beefy torque at 50Nm for only 2.1 kg for the 250w model (doesn't mention RPM so would have to find out - it would be easier lifting the bike onto the roof of the car!)?

100SX light weight high speed rear wheel hub motor for electric conversion kit drive system

a geared hub motor has gearing inside it to reduce the high speed of a fast and efficient motor to the low speed of the wheel. Aikema is dedicated to providing the very best quality motors and service.We strive to be the best in the industry and innovate our products.

www.aikema.com.cn

and I would pair it with these perhaps:

https://smile.amazon.co.uk/gp/product/B07MNN85ZX/ref=ox_sc_saved_title_4?smid=A6XQPVRXUZ1KA&psc=1


https://www.ebay.co.uk/itm/48V-13AH-Li-ion-E-Bike-Battery-Electric-Bicycle-Power-Pack-1000W-With-Charging/264826236621?_trkparms=aid=555021&algo=PL.SIMRVI&ao=1&asc=20190711100440&meid=e0803e6f3b15432e8ca5dbf2817eab71&pid=100752&rk=5&rkt=18&mehot=co&sd=353200725334&itm=264826236621&pmt=1&noa=0&pg=2047675&algv=SimplRVIAMLv5WebWithPLRVIOnTopCombiner&_trksid=p2047675.c100752.m1982

I looked at the battery above as it allowed fast discharge, although I have to see what the frame can take when the bike arrives as I don't want to negate the step through aspect as that is a must. I didn't want to rear rack mount the battery especially with the 4kg Woosh hub, but it wouldn't be so bad with the hub above.

Thank you for your patience with me.

 

[vfr400]

You can't run that motor at 20 amps and 48v. The gears aren't strong enough. It's not really a good motor for a weak heavy rider eiether. The larger AKM128SX would be better, either 48v 260 rpm or 36v 201 rpm run at 48v.

 

[MontyPAS]

Just looking at options as this is a big purchase for me and I want to get it right.

Does anyone have views on this Akeima 100sx, please, as it seems a pretty beefy torque at 50Nm for only 2.1 kg for the 250w model (doesn't mention RPM so would have to find out - it would be easier lifting the bike onto the roof of the car!)?

100SX light weight high speed rear wheel hub motor for electric conversion kit drive system

a geared hub motor has gearing inside it to reduce the high speed of a fast and efficient motor to the low speed of the wheel. Aikema is dedicated to providing the very best quality motors and service.We strive to be the best in the industry and innovate our products.

www.aikema.com.cn

Thats a bare hub. Are you building the wheel as well?

 

[Dali]

Thanks vfr. I was just making sure components were capable, not necessarily going up that high but likewise never gave a thought to stripping gears. I will look at your suggestion.

MontyPAS - I don't have a problem building a wheel if there is a big benefit to it (unless it is more complicated than it seems with hidden dangers) as have replaced broken spokes and fixed many a buckle in my youth, but actually I just put that up there for the spec's and was going to see if it is sold anywhere as a wheel.

 

[vfr400]

Thanks vfr. I was just making sure components were capable, not necessarily going up that high but likewise never gave a thought to stripping gears. I will look at your suggestion.

MontyPAS - I don't have a problem building a wheel if there is a big benefit to it (unless it is more complicated than it seems with hidden dangers) as have replaced broken spokes and fixed many a buckle in my youth, but actually I just put that up there for the spec's and was going to see if it is sold anywhere as a wheel.

You can buy motor wheels with those motors and many others from the Chinese resellers that we regularly use: Topbikekit, BMSBattery Greenbikekit, PSWPower, etc.

 

[Dali]

You can buy motor wheels with those motors and many others from the Chinese resellers that we regularly use: Topbikekit, BMSBattery Greenbikekit, PSWPower, etc.

Excellent, thank you. I looked at the AKM128SX and it is 350W and my wife won't stray from 250W written on the motor, so still looking like the Woosh SWX02 48v kit is coming out best. Although I can't seem to leave that 2 speed one you mentioned off the list and will look on those sites for that too.

 

[Nealh]

Cwah and many others over on ES have cooked the akm100 by over volting and using higher current.

 

[Dali]

Cwah and many others over on ES have cooked the akm100 by over volting and using higher current.

Thanks for the heads up as I don't want to do anything a motor isn't designed for.

 

[MontyPAS]

MontyPAS - I don't have a problem building a wheel if there is a big benefit to it (unless it is more complicated than it seems with hidden dangers) as have replaced broken spokes and fixed many a buckle in my youth, but actually I just put that up there for the spec's and was going to see if it is sold anywhere as a wheel.

I will tackle most jobs on bike maintenance / building, but draw the line at wheel building..... Its a black art.

Its one thing tightening a spoke.
Its another building a reliable strong wheel from scratch that will withstand the extra torque delivered by an electric motor.

Just my opinion..... others are available

 

[vfr400]

I will tackle most jobs on bike maintenance / building, but draw the line at wheel building..... Its a black art.

Its one thing tightening a spoke.
Its another building a reliable strong wheel from scratch that will withstand the extra torque delivered by an electric motor.

Just my opinion..... others are available

That's what I thought until I built my first wheel using Sheldon Brown's guide. I've done about 20 now, so I can do it while I watch Netflix and get them relatively true before I do the truing.

The one I built last week was the first for about a year, and I forgot to underlap the spokes on the second cross, so I had to take 18 spokes out one at a time and put them back properly. Luckily I spotted it when the wheel was only laced, not tightened and trued, so it only wasted about 20 minutes.

Rear wheels often need the amount of dish changed from what you receive, because they have no idea how much off-set you have in your frame, if any. By the time you've adjusted the dish and re-trued the wheel, it's not a lot more work to build the whole thing from scratch. Also, our Chinese friends are not very good at wheel-building, so there's nearly always something that needs adjusting.

 

[Dali]

I will tackle most jobs on bike maintenance / building, but draw the line at wheel building..... Its a black art.

Its one thing tightening a spoke.
Its another building a reliable strong wheel from scratch that will withstand the extra torque delivered by an electric motor.

Just my opinion..... others are available

I appreciate the warning, but this is why tradesmen can write their own cheques as people don't try/learn anything these days (I do not mean you btw). I know people who pay electricians to put a plug on (and a good job too probably). First time I stripped an engine it seemed like a black art, so I sat down with a Haynes manual and taught myself. Some things require specialist knowledge of course so shouldn't be attempted, like ironing.

And diminish fixing a buckle all you like, but it is harder than you think and I still say that this is exactly the kind of skill required. I used to make 50p - £1 a wheel as a kid, back when it was a new invention , and is harder than 'tightening a spoke' which is why I was able to buy a new bike with the proceeds.

 

[1boris]

My wife won't go for a 20" wheel and that's a shame as it would have been an easy and cheap solution.

I like the idea of the Xiongda 2-speed motor and can't believe they aren't taking over, but they are only from China that I can find (by that I mean no EU warehouse) and don't say 250w, which seems to be a must for my wife. And as you say, Nealh, Woosh do so that is their biggest selling point for me. I would also have to build the Xiongda into my wife's wheel. I can't see this is particularly difficult as I have fixed buckles on steel wheels before, but it is extra hassle and something else to go wrong. 70Nm, though! But the 48v SWX02 will be going into a 26" so will be plenty I hope. Bike comes Tuesday and I will pre-order from Woosh after that after confirming the kit will fit. (Unless another brainwave hits!)

Woosh, do you happen to know the rpm of the SWX02, please?

I have the Woosh 48v swx02 250w kit.and I have xiongda.I would recomand the 48 volt 250w swx02 over the Xiongda.It has plenty of torque and a top speed with fully charged battery about 33kmh.(28") wheel.All my 4 xiongda motors are broken.
I have changed battery and controller on the swx02 kit,and now use a 48volt 22 a controller.The motor have no problems so far.No overheating tendences

 

[Dali]

Thanks for that info. Shame about the Xiongda. Good to know about the Woosh. What was the kit like on hills before you changed some of the items out (my wife won't go over 15mph)?

 

[vfr400]

Thanks for that info. Shame about the Xiongda. Good to know about the Woosh. What was the kit like before you changed some of the items out?

The Xiongda 2-speed has one weakness. The double clutch arrangement doesn't work very well when you push the bike backwards. When it sticks, you get massive torque multiplication to the gears, which breaks something if you keep pushing. It's fine as long as you don't continue to push the bike back when it sticks.

I've done thousands of miles with my two. The first 36v one got chucked and replaced with a 48v one after I slipped on ice and wore through the motor cable, which I couldn't be bothered to fix. No problems with the second one.

There were some grease issues in the beginning, which made them chatter, but I found a better grease, which fixed it. Xiongda took the spec from me, so that's probably fixed now.

All this was 6 years ago when the 2-speed was a new product. I know they made some improvements to the clutch, but by now they should have everything sorted otherwise they wouldn't be still selling it.

They also had problems with their tiny 1.75kg motors because of the two stage axle and massive reduction ratio. Again, they made some sort of improvements. My original one is still working OK, but I haven't used it much.

Their other motors, like their BPM and CST don't include fancy technolgy. They use all the standard Bafang parts. the only thing Xiongda does is the winding and soldering, and those things are difficult to get wrong and rarely fail on any motor.

 

[Dali]

There were some grease issues in the beginning, which made them chatter, but I found a better grease, which fixed it. Xiongda took the spec from me, so that's probably fixed now.

Blimey, that is impressive.

And thousands of miles use would take Lisa to the year 2098 so can't say fairer than that.