60 or 80Nm front hub motor

[guerney]

Mapometer

Cool! Bookmarked. There aren't any hills anywhere near me, as steep and as long as that, but I breeze up this one while dragging a 90kg+ bike trailer (+me+bike=180kg total), while defeated local real cyclists look on at my silly looking ickle folding bike with amazement. This hill is a favourite for local masochists. Progress was slow at 15A, would be a bit faster with the current 20A current.





Rear QR axle gets yanked out by the trailer hitch, when trailer cargo is over 100kg + 15.5kg trailer, else I think my bike would be capable of dragging that weight up too, plus 68kg of me and 22.41kg of bike = 205.91kg. Might be forced to drop chainwheel size from 52T to do so, sacrificing no-haul speed on flat road, but I'll never know.

 

[Nealh]

Oil cooling a Bafang SWXH geared hub motor | Electric trike

 

[chris_n]

A local to me climb 10kM with 1kM elevation change from start to end, often wondered how it compares with some of the questions asked on here.

 

[chris_n]

A couple more from my front door.

 

[matthewslack]

Mapometer, and tick the tick boxes for gradient and elevation

This is Ingleby Incline (which is off road track) that I've only done on my mid drive bike

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Eta. The other climb I referenced that I use my rear hub bike for was Carlton Bank

The motor data for that would be interesting, for both bikes!

 

[Peter.Bridge]

A couple more from my front door.
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OMG - different level ! Where do you live ? Is that off road ?

 

[guerney]

A couple more from my front door.
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A couple more from my front door.
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@chris_n - Wow, and I realise the following comment will put the cat among the pigeons, but no wonder hub motors didn't catch on with the population of your country.

 

[guerney]

OMG - different level ! Where do you live ? Is that off road ?

If memory serves, he's a retired ex-James Bond/demolitions expert or something hiding or exiled in the Swiss Alps, with a Bosch.

 

[chris_n]

If memory serves, he's a retired ex-James Bond/demolitions expert or something hiding or exiled in the Swiss Alps, with a Bosch.

Not quite but not far off. I am a retired Engineer living in the Austrian Alps who teaches people to ski in winter time hence the profile pic (that is my office). My previous bike was a Yamaha hardtail the current one is a Merida fully with Shimano motor, I can't remember whether it is a 680 or 750Ah battery. Most of my riding is off road with most trips being around 80km with +/- 2000 metres of climbing. The second 2 climbs I posted are 2 different ways up the front side of that mountain. I did ride down one of the steeper ski pistes once, that was an experience.

 

[Peter.Bridge]

Not quite but not far off. I am a retired Engineer living in the Austrian Alps who teaches people to ski in winter time hence the profile pic (that is my office). My previous bike was a Yamaha hardtail the current one is a Merida fully with Shimano motor, I can't remember whether it is a 680 or 750Ah battery. Most of my riding is off road with most trips being around 80km with +/- 2000 metres of climbing. The second 2 climbs I posted are 2 different ways up the front side of that mountain. I did ride down one of the steeper ski pistes once, that was an experience.

I can't even imagine !

 

[guerney]

Not quite but not far off. I am a retired Engineer living in the Austrian Alps who teaches people to ski in winter time hence the profile pic (that is my office). My previous bike was a Yamaha hardtail the current one is a Merida fully with Shimano motor, I can't remember whether it is a 680 or 750Ah battery. Most of my riding is off road with most trips being around 80km with +/- 2000 metres of climbing. The second 2 climbs I posted are 2 different ways up the front side of that mountain. I did ride down one of the steeper ski pistes once, that was an experience.

Bosched or not, seems unlikely unfit riders would cope with that terrain. Have you seen any Bafang mid-drive conversions? Or are the Swiss too wealthy to grub about with cheap gear?

 

[guerney]

View attachment 61606

I can't even imagine !

I tried to ascend two long artificial banks which were at 45° or more, the motor was game but my bike's balance wasn't. There's nothing else for it, you're going to have to go to the Alps. Would a Bafang mid-drive burn out?

 

[Peter.Bridge]

I tried to ascend two long artificial banks which were at 45° or more, the motor was game but my bike's balance wasn't. There's nothing else for it, you're going to have to go to the Alps. Would a Bafang mid-drive burn out?

On Ingleby Incline (1 mile @20%), my BBS02B Boardman 29er goes up fine but there is a gate half way up. I really struggle to get going after the gate because it is so steep - combination of balance (more mine than the bike's) and wheelspin

 

[guerney]

On Ingleby Incline (1 mile @20%), my BBS02B Boardman 29er goes up fine but there is a gate half way up. I really struggle to get going after the gate because it is so steep - combination of balance (more mine than the bike's) and wheelspin

Would reducing "Start Current" in firmware prevent wheelspin?

The one time I miss my bike having a throttle, is the tight bend in the path in a nature reserve, where I have to weave between three barriers while hauling a 90kg trailer, halfway up this - so short your Map-o-matic website can't compute. I've learned to do it without having to stop, but when I get it wrong it's a right ****&%!! starting again towing that much weight.

 

[guerney]

Oil cooling a Bafang SWXH geared hub motor | Electric trike

That specific one is about £175 on ebay. Are there generally a lot of readily available spare parts for Bafang hub motors? More than for AKM?

 

[saneagle]

That specific one is about £175 on ebay. Are there generally a lot of readily available spare parts for Bafang hub motors? More than for AKM?

Loads of spares for all Chinese motors on Aliexpress. Use Google:

Google Search

 

[Peter.Bridge]

Would reducing "Start Current" in firmware prevent wheelspin?

The one time I miss my bike having a throttle, is the tight bend in the path in a nature reserve, where I have to weave between three barriers while hauling a 90kg trailer, halfway up this - so short your Map-o-matic website can't compute. I've learned to do it without having to stop, but when I get it wrong it's a right ****&%!! starting again towing that much weight.


View attachment 61607

I think it's just a combination of a very loose mud/ gravel surface and it being very steep, usually use about 40-50% power to try and minimize wheelspin

 

[chris_n]

I think it's just a combination of a very loose mud/ gravel surface and it being very steep, usually use about 40-50% power to try and minimize wheelspin

That is one of the reasons I started using a dropper post, easy to keep traction while seated.

 

[chris_n]

Bosched or not, seems unlikely unfit riders would cope with that terrain. Have you seen any Bafang mid-drive conversions? Or are the Swiss too wealthy to grub about with cheap gear?

There aren't too many Swiss in Austria, can't say I have ever noticed a conversion. There was a guy in the village advertising conversions a few years ago but haven't seen any and he doesn't advertise now.

 

[chris_n]

View attachment 61606

I can't even imagine !

I like to get to the end of that bit (off road) as the rest allows you to get into a settled rhythm with heart rate / breathing etc at manageable levels until you get near the end of that bit. There is actually another bit of climbing required to get to the top but I couldn't get the software to do it without sending me a different way.
Another local quite steep route

Close to a kM at over 30%, yes that one is a bit strenuous, all off road.