Does bicycle weight really matter?

[JohnCade]

I'll replace the SR2 set with something else to match the rear wheel with same tyre with reflective band, rim and spokes. The problem is spoke length, can't re-use the SR2's rear spokes. Originally, I was looking for a lightweight crank drive to keep the Giant SR2 wheelset. Now I am going to keep the hub kit at least until end of 2016.

I’m toying with the idea of doing this with my Cube road bike but was thinking of the Keyde system. This motor would be cheaper but a bit heavier at 2kl I think you said. But a battery that size and weight would be a no no for me. I would only want assistance on some of the steep hills and so a small old fashioned bottle type that looked like a bottle would do. Maybe 6 Ah with a simple on/off switch.

I wonder if that could be done with this motor and where the controller would go?

#121

 

[trex]

the controller on my D5 is integrated in the battery casing, model Lishui HL1260. I'll check with the battery suppliers, one of them may want to make a custom battery for me in 10S3P in an HL case with NCR3400mAH cells.

 

[anotherkiwi]

I’m toying with the idea of doing this with my Cube road bike but was thinking of the Keyde system. This motor would be cheaper but a bit heavier at 2kl I think you said. But a battery that size and weight would be a no no for me. I would only want assistance on some of the steep hills and so a small old fashioned bottle type that looked like a bottle would do. Maybe 6 Ah with a simple on/off switch.

I wonder if that could be done with this motor and where the controller would go?

#121

You could buy this empty case which accepts a 15A sine wave controller in the base and have someone build a 6A battery to go inside. It could possibly be shortened as you will have removed a layer of batteries. Shoot a bit of matt black stealth fighter paint on it and bobs your uncle...

 

[trex]

The saddle angle needs changing.

It's a very nice build, and gets a big thumbs up from me.

Done.
@Yamdude: front wheel also replaced to match rear wheel with 13 gauge spokes and tyre.

 

[Yamdude]

Done.
@Yamdude: front wheel also replaced to match rear wheel with 13 gauge spokes and tyre.

That finishes it off a treat......
Top stuff.

 

[trex]

thanks YD. Still thinking about making a custom cable between the controller and the LCD and hide it inside the downtube. Suggestions welcome. Wireless maybe?

 

[Kenny]

Looks terrific Trex.

I've been searching for years for an unobtrusive, lightweight set up like this to fit to my Scott Sportster that has been gathering dust since I got my ProConnect.

I'm sure this would be very popular if it was available as a complete kit.

 

[EddiePJ]

Having never really looked this kind of set up before, the bike that you have built, really intrigues me, and I might add something like this to a 'to make' list.

I'm very used to carrying a pack back of roughly 5kg including a spare battery, and rather than fitting the battery to the bike, I quite like the idea of a discreet and possibly curved back pack battery.

What solutions are available in respect of that train of thought?

 

[flecc]

Having never really looked this kind of set up before, the bike that you have built, really intrigues me, and I might add something like this to a 'to make' list.

I'm very used to carrying a pack back of roughly 5kg including a spare battery, and I'm wonder whether rather than fitting the battery to the bike, I quite like the idea of a discreet and possibly curved back pack battery.

What solutions are available in respect of that train of thought?

Back in 2007 Team Hybrid had a BMX e-bike team doing stunts, and they used the Crystalite rear hub motors with backpack batteries. I'm sure the batteries at that time wouldn't have been anything specially shaped and they seemed comfortable enough doing stunt jumps with the battery weight in their back packs.

It seems a good battery carrying solution for this kind of performance e-bike.
.

 

[Alan Quay]

Having never really looked this kind of set up before, the bike that you have built, really intrigues me, and I might add something like this to a 'to make' list.

I'm very used to carrying a pack back of roughly 5kg including a spare battery, and rather than fitting the battery to the bike, I quite like the idea of a discreet and possibly curved back pack battery.

What solutions are available in respect of that train of thought?

I too have no problem carrying weight on my back, so I've experimented with a back pack battery.

What's great is that the bike remains as close to a bike as its possible to be. Handling is vastly improved, as the battery weight is controlled by your body.

There are down sides. Safety for one (never bothered me), discomfort if not used to carrying stuff and slight extra hassle (putting back pack on, connecting cable).

I used mine with a 20ah 36v battery, although I confess that I've never covered vast distances on it.

I may yet build a folder. I would go backpack battery on that.

 

[Cyclezee]

We are going to have a back pack battery to power a rear hub motor on this downhill bike....but only to get it up hill.

This is the pre production model, the frame was designed and made in Milton Keynes.

 

[soundwave]

you try jump that with a rear hub motor you must be bonkers pm me when its ready

 

[Cyclezee]

you try jump that with a rear hub motor you must be bonkers pm me when its ready

Downhill racing is already bonkers, in my previous occupation I helped with the facial reconstruction of a downhill racer who collided with a tree.

If you want to order the human only powered version, just send a cheque, the price comes to five figures....before the decimal point

 

[soundwave]

im not paying to brake it ill just give u back whats left of it after a test ride.

 

[trex]

Having never really looked this kind of set up before, the bike that you have built, really intrigues me, and I might add something like this to a 'to make' list.

I'm very used to carrying a pack back of roughly 5kg including a spare battery, and rather than fitting the battery to the bike, I quite like the idea of a discreet and possibly curved back pack battery.

What solutions are available in respect of that train of thought?

Eddie, I think 15kg is the magic number. You can carry your bike over puddles etc. I was looking at the picture of your e-race P and thought that carrying a battery in the backpack for a rear-hub E-MTB makes sense.
To the drawing board for a good looking 15kg e-MTB. Don't think it can be done for under £1,000 though. I am looking at the Giant Talon 0 RC now.

 

[Cyclezee]

im not paying to brake it ill just give u back whats left of it after a test ride.

Thanks for the offer, but there is already an orderly queue of crash test dummies who don't need psychostimulants ready and willing to try and destroy it

By the way, can anyone see why the pre production version shown in the photo above won't work

 

[flecc]

By the way, can anyone see why the pre production version shown in the photo above won't work

Yes, it's got no transmission.

But it will still work downhill of course!
.

 

[Cyclezee]

Yes, it's got no transmission.

But it will still work downhill of course!
.

I knew you would be the first to spot that Tony, but I was also expecting something a little more specific

 

[flecc]

but I was also expecting something a little more specific

More details then. Cranks out of line, no cassette, chain or rear mechanism.
.

 

[soundwave]

if i can brake my xd hub jumping my bike i dont think a hub motor will take the jumps very well.