C
Cyclezee
Guest
Join the club.....sorry, you have already and what's more you have a friendstrictly for what its worth - I genuinely know nothing about pedelecs, but I have a friend
Join the club.....sorry, you have already and what's more you have a friendstrictly for what its worth - I genuinely know nothing about pedelecs, but I have a friend
You're absolutely right for motors like Q100, Bafang SWX and other motors up to 120mm in diameter, but you can't get enough traction for a high-torque motor like a BPM with 25 or 30 amps, especially when going up hill. On a 25% hill, it'll spin all the way up. I draw the line for a front motor at 350w or about 20A. You get the other problem too above that power, that it's not easy to mount one securely in aluminium forks. I've seen one spin out of the drop-outs that had two well-mounted torque arms. We had to change the forks to steel.I find it interesting that no one has mentioned one of the big advantages of a hub drive over a crank drive yet. With a front hub motor, the bike is 2wheel drive when you peddle. This gives better traction on slippy surfaces like mud, wet tarmac and ice and thus better handling in poor conditions with less chance of spinning out. It also makes tyre wear more even than if all of the drive is coming through the rear wheel. (For this reason alone I will not consider anything but front hub drive.)
Puncture proof tyres make changing a tyre so rare that the requirement for a spanner is not an issue either.
James
I entirely agree James and have said as much many timesI find it interesting that no one has mentioned one of the big advantages of a hub drive over a crank drive yet. With a front hub motor, the bike is 2wheel drive when you peddle. This gives better traction on slippy surfaces like mud, wet tarmac and ice and thus better handling in poor conditions with less chance of spinning out. It also makes tyre wear more even than if all of the drive is coming through the rear wheel. (For this reason alone I will not consider anything but front hub drive.)
Puncture proof tyres make changing a tyre so rare that the requirement for a spanner is not an issue either.
James
Who's that addressed to and what does it mean?... But you're all about max speed and power Dave and most people don't need to go that far.
It means (tongue in cheek) d8veh, that you seem to use all of your vast technical knowhow to build formula 1 style ebikes from the ground up at a budget (at least that is how many of your posts can read.) It was not meant to offend, but as a kind of backhanded compliment whilst reminding the OP of the wording of the law. (I am equally aware of your interpretation of that wording and how it differs from some others and had not been tested yet!)Who's that addressed to and what does it mean?
I agree totally. While the UK have not officially adopted EN15194, all those big hubs including those laser marked to 250W may not be legal after all. Some smart lawyers may insist to measure their output power the old fashion way....
(But hitting a child on a bike or being hit by a car will get the wording of the legality tested VERY quickly indeed!)
"old fashioned way" sounds intriguing, it should, at the very least, involve a few prostitutes and a good whipping..I agree totally. While the UK have not officially adopted EN15194, all those big hubs including those laser marked to 250W may not be legal after all. Some smart lawyers may insist to measure their output power the old fashion way.
That's not quite right. I build every type of bike I can, but I've never built one with a motor rated at more than 500w except, the one that was specifically built for the World Championship race on a closed road. I don't use it on the road. Those bikes above have small low-powered motors and are probbly no faster than yours.The top one, which is restricted to 15.5 mph and bears a 250w label will be my main bike until I find a better one (which will be difficult). I only travel at 12 to 14 mph except downhill.or with the wind behind me. The reason I build a lot of different bikes is mainly to explore the technology and possibilities.It means (tongue in cheek) d8veh, that you seem to use all of your vast technical knowhow to build formula 1 style ebikes from the ground up at a budget (at least that is how many of your posts can read.) It was not meant to offend, but as a kind of backhanded compliment whilst reminding the OP of the wording of the law. (I am equally aware of your interpretation of that wording and how it differs from some others and had not been tested yet!)
James
(But hitting a child on a bike or being hit by a car will get the wording of the legality tested VERY quickly indeed!)
They can measure them how they like. EN15194 does not restrict the maximum power.I agree totally. While the UK have not officially adopted EN15194, all those big hubs including those laser marked to 250W may not be legal after all. Some smart lawyers may insist to measure their output power the old fashion way.
Don't you go foisting your interpretation of 'bedtime' upon me!At least it's near bed time.
have a look at http://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&sqi=2&ved=0CDsQFjAE&url=http://www.gopedelec.eu/cms/dmdocuments/legalAspectsOfPedelecs.pdf&ei=sc2lVOHCEaev7AaOjIHYDg&usg=AFQjCNHBFmc9ZKMfCzTaohGrPggUlQ0GVgAt least it's near bed time.
I think the issue here is there is so many to pick from, your best bet is to troll the bike forums for the bikes/frames you like and see what opinion says.So err, any recommendations on frames?...