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I am older than I care to admit. I recall my father extolling the virtues of 3 Speed Sturmey Archer when I built a bike with 10 derailleur gears (2x 5) when I was perhaps 15 in the late 60's. When I went to 20 in early naughties (2 x10) he nearly fell off his chair. I'm still on 2x10 btw, I've...

I fully agree in principle, however having thought about this, surely riding at lower power outputs means that efficiency has a larger effect on speed. If say 25watts is need to overcome resistance, then a rider pedalling at 125Watts will lose 20% of his power, whereas a rider pedalling at...

And it doesn't stop there. I found this article which looks at lubrication and gear choice vs efficiency. Published 19 years ago mind.

Indeed it seems to Hub gears are more about lower maintenance and simplicity of use (albeit that the internals are complex).

The attached technical journal published in 2001 covers the gear efficiency subject comprehensively. Personally I tend to clean my drive train very frequently, certainly before and after any events I ride and most weeks when I'm just riding/training, especially in winter. With transmissions...

Well I didn't find a definitive answer to my efficiency question of derailleur vs Internal Hub Gear or is it Internal Gear Hub? Most opinions range from the Hub Gear being 3%-8% less efficient compared with a well tuned, clean derailleur. For an ebike, I don't see this being a huge issue...

Wow, some differing opinions here. Though I'd throw mine in. Firstly the Nexus isn't totally maintenance free. It runs as a sealed unit and is greased, unlike the £1,000 Rohloff which runs in an oil bath which can be drained and refilled in situ. The Nexus will need to be re-greased every...

Some have a hot button that works quite well..................tricky finding the right moment to press it though ;) But we digress..................

I have 250w and 500w motors, both 36v. I'm happy with 9 power levels on my 500w 29er, but my wife would like 4 power levels on her 700c Hybrid. I have reprogrammed both controllers using a USB lead and I am happy with my 9 power level settings. But when I use the C961 display to set 4 power...

I'd suggest you read the legislation available on the Forums home page. My understanding to be legal is that the motor MUST be stamped no more than 48v and no more than 250w. Speed should be limited to 25kph (just over 15 mph). There is something to do with throttles as well. I cant answer your...

The 36v 500w has a bigger casing and (I'm guessing) the stator/rotor is heavier duty to facilitate the higher current of 25A as programmed at the factory. I have both the BBS01 250w and the BBS02 500w. I've reprogrammed both. The 500w motor is slightly heavier than the 250/350w motor. I can say...

Curious. Message 4 indicates throttle not returning to zero state. Did you go into the throttle settings at all? I'd have a look in the throttle tab to see if you spot anything odd. I don't use a throttle, so cant really help, but if you have a look here, you might find something...

Doesn't ring true somehow. How about a longer stem and longer seatpin with some setback? Have a look at the spec, the 50cm reach is only 19mm longer. Just buy a stem 20mm longer and if you need the saddle higher/further back, buy a 400mm set-back seatpost. Job done for say £40

I read somewhere that the BBS01 36v 250W (15A) max power is achieved at 78rpm. The BBS02 36v 500w is 120 rpm (ish)and the 48v 750w is around 140 rpm.(??) In each case a tolerance of +/- 6 (ish?) rpm was quoted. These were not "NO-LOAD" figures. I'll see if I can find the articles and come back...

If I can add my tuppence worth.............PAS is exactly that, you turn the pedals and motor kicks in, you have the same freewheel as a normal bike. ie you can coast downhill without pedalling. The BBS series of motors all have similar characteristics, they go up hills really well, but you need...

Hi Kinninvie, I've already fitted the 42t chainring with 9 speed 11-34t. I find that some of the spacings on the 9 speed cassette are a little wide, hence thinking of moving to 10 or 11 speed. I also occasionally find that on very steep climbs in bottom gear I have to up the PAS to get the...

My 36v 500w BBS02 has now covered over 1000 miles. I've ridden all kinds of roads and trails and am now happy with my re-programming of the controller as per earlier posts. My controller is set to limit current not limit speed, hence the motor is free to spin as fast as it can according to the...

Hi Simon, I was looking to upgrade as a preventative measure rather than replace burned out FET's. In the end I decided to stick with the installed originals. I made this decision on the basis that the 36v controllers have been less problematic than the older 48v controller. In addition I've...

I've now done 500 miles on my 29er hardtail with BBS02 36v 500w. It's fitted with a pair of Richey Excavader 35c folding tyres on the basis that I ride a mix of road, tow-paths, bridleways and easy trails. I'm not into mud-plugging, hence the narrower section. They're probably more of a...

Before I reconfigured my BBS02 I rode around in PAS 3 most of the time. It seems to me that riding in PAS 3 all the time is like putting a motorbike in 3rd gear and expecting it to perform no matter what the terrain/conditions. You're getting away with it due to the huge torque of the BBS02 48v...