May 20, 20205 yr Hi I'm new to converting bikes into ebikes. I'm starting with my first as a Fatboy. Anyone bought this kit of eBay? If so is it fairing well? https://www.ebay.co.uk/itm/333453490418 I'm looking at getting both front and rear wheels with a 1500w motor, most likely make my own battery pack. Thanks FATBOY2000
May 21, 20205 yr Those 1500w motors are direct drive rather than geared hubs. As such they are renown for being very heavy on batteries. At low speed or on hills they are inefficient and will turn a lot of power drawn from the battery into heat. So good only on flat rides with little stop start and at speed. The battery needs to have top quality high amp cells and a maximum current capability of 1.5 times the maximum current delivery of the controller in order to avoid voltage sag and cell damage. To run two motors you will need two controllers making the battery even bigger/heavier. Now, lets mention legality, 'cos if I don't someone else will. A 1500w motor is not legal as a pedalec and, because of physical size, is impossible to diguise. The speed at which it will run will also make it illegal. To be legal it would need to be type approved, registered and insured as a moped. It would still be limited to 15.5mph and you would need to wear a motorcycle helmet and ride on roads only. Two motors is just plain illegal, no wiggle room. Given the weight of the battery and motors and the speed/power you're after, why not just go and buy an electric motorbike?
May 21, 20205 yr Author Those 1500w motors are direct drive rather than geared hubs. As such they are renown for being very heavy on batteries. At low speed or on hills they are inefficient and will turn a lot of power drawn from the battery into heat. So good only on flat rides with little stop start and at speed. The battery needs to have top quality high amp cells and a maximum current capability of 1.5 times the maximum current delivery of the controller in order to avoid voltage sag and cell damage. To run two motors you will need two controllers making the battery even bigger/heavier. Now, lets mention legality, 'cos if I don't someone else will. A 1500w motor is not legal as a pedalec and, because of physical size, is impossible to diguise. The speed at which it will run will also make it illegal. To be legal it would need to be type approved, registered and insured as a moped. It would still be limited to 15.5mph and you would need to wear a motorcycle helmet and ride on roads only. Two motors is just plain illegal, no wiggle room. Given the weight of the battery and motors and the speed/power you're after, why not just go and buy an electric motorbike? Honestly I just figured seeing as I'm fat I would need the motors to get that extra push to get any real climbing ability lol. Thanks for letting me know I'm a newbie to ebikes. I wouldn't mind building a electric motor bike at some point when I get used to the electronics side of things.
May 21, 20205 yr Honestly I just figured seeing as I'm fat I would need the motors to get that extra push to get any real climbing ability lol. Thanks for letting me know I'm a newbie to ebikes. I wouldn't mind building a electric motor bike at some point when I get used to the electronics side of things. https://www.evwest.com/catalog/product_info.php?cPath=8&products_id=297
May 21, 20205 yr Author https://www.evwest.com/catalog/product_info.php?cPath=8&products_id=297 That's a pricey one haha
May 22, 20205 yr Have a look at Woosh bikes kits, specifically the BPM. These are torquey geared hub motors and seriously good at hills. They are specced for the larger person. Whilst not strictly legal ('cos it's rated either at 350w or 500w - I don't remember) it does at least look the part. Combined with a controller limited to 15.5mph you're unlikely to have an issue.
May 22, 20205 yr The Woosh front BPM is 250w, but the rear is indeed 350w. There is a list with torque etc a little down the page https://wooshbikes.co.uk/?hubkits. The FATG06 has more torque than the BPM but remains a legal 250W. FAT G06 5.1kgs 160mm freewheel 65NM BAFANG G06 250W rear motor wheel for fat bikes, available with or without 26" rim
May 22, 20205 yr Author Have a look at Woosh bikes kits, specifically the BPM. These are torquey geared hub motors and seriously good at hills. They are specced for the larger person. Whilst not strictly legal ('cos it's rated either at 350w or 500w - I don't remember) it does at least look the part. Combined with a controller limited to 15.5mph you're unlikely to have an issue. Nice thanks for the information I'll delve into this this weekend. Seems peeps are starting to sell all those impulse bike buys so I'll be getting something nice in the next week or two.
May 22, 20205 yr Author The Woosh front BPM is 250w, but the rear is indeed 350w. There is a list with torque etc a little down the page https://wooshbikes.co.uk/?hubkits. The FATG06 has more torque than the BPM but remains a legal 250W. FAT G06 5.1kgs 160mm freewheel 65NM BAFANG G06 250W rear motor wheel for fat bikes, available with or without 26" rim Nice one cheers buddy I'll look into the different models to get the best suited.
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