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The upgraded Zephyr CDN will be here in the Autumn. The crank drive has a clutch around the bottom bracket. The chain ring is mounted to the outside of the clutch. When you pedal forward, the clutch is engaged, when you pedal backwards, the clutch is disengaged, the chain does not move when you...

Not a problem but there are other models with larger frames, longer wheelbase gives better stability. The Zephyr CDN would suit her but it's going to be upgraded soon, with bigger battery. It's only a guess, she should really try these bikes for herself.

Assuming that you have retained the right parts, you only need to clean, grease and refit - no need to spend your money unless the pieces are shot. This article sums up pretty much what you need to do. The parts are not the same, but the sequence is the same...

if people ride their bikes as many miles as they drive cars, then the bike business will be like the car business.

it's not enough to visit Halfords or Evans and take a look at their bikes. You need to ride at least 5 minutes on each bike that you think may suit. They all have different handling feel, power level, gear change, braking etc. She may like the woosh Gale best. http://wooshbikes.co.uk/?gale I...

motors are not user serviceable but some of us like to tinker.

then your local MP won't be local anymore.

it seems that your clutch needs replacing. Cost: about £10-£15.

ask d8veh, he may want to sell his.

Yes. it's very difficult to build a high spec lightweight bike, especially folders. If you omit the suspension, you can get down to 10kgs, with suspension, around 12kgs. The Dahon Jetstream P8 is a case in point. That bike is built with quality in mind, and it shows, but it weighs 13.5kgs.

too heavy. The mid drive kits weigh about 4.8kgs + battery + rack = 8kgs

all the kits with SWXU/K weigh about 6kgs. You can buy the 8-Fun one if you like, the battery is not very good though. Woosh usually stock the hi tech batteries as used on their bikes. The woosh Petite's 15AH battery weighs about the same as the 8-Fun 10AH.

yes if you change the fork, fit a suspension one. Don't go for cheap options if you go for a conversion, that'll be like reinventing the wheel. Good kits: that depends on the bike.

they are Chinese bikes, wihout suspension. Just think of riding them over potholes. To do the miles that you have in mind, 18 miles a day, 5000 miles a year, you need a bike as good as d8veh's Dahon Jetstream P8 that has trapezoid front suspension and air suspension at the rear. The P8...

that's a front hub kit, requiring 100mm dropout. Most quality front forks have 80-83mm drop out and tappered, you can't fit that front hub motors in them. Post a picture of your folder then we'll help you. http://www.ternbicycles.com/forum/converting-tern-d8-electric

Most quality folders have prorietary parts to optimize their features, converting a 20" bike is mechanically more difficult than converting a 26" bike. The best candidates for conversion are Dahon bikes. Most of them need a rear rack battery, very difficult to find a rack that looks good and...

both bikes are built to similar specs, the Vita is still on special offer, the Cobra isn't.

direct drive e-bike motors have KV in the region of 7 to 10, helicopter motors have KV in the region of 1000 to 1500. At low speed, motors are naturally less efficient. The design of e-bike motors needs to be very much more advanced to minimize loss of efficiency.

you can't add much to ready built bikes.

those 4 screws hold the casing of the motor. You don't need to touch them. If in doubt, ask Andy @ woosh. He would know.