Who likes Crank-drives?

[Deleted member 4366]

If you do, you can look forward to seeing these in the shops soon. There were also other motors in bikes that I didn't recognise, plus offerings from Xofo and Ananda.

 

[Arbol]

Were all clones of each other?

 

[Kudoscycles]

If you do, you can look forward to seeing these in the shops soon. There were also other motors in bikes that I didn't recognise, plus offerings from Xofo and Ananda.

Wow,Dave..on the Pedelecs already,they makes you guys tough in Telford,hope you and Andrew had a good trip back,see my PM
KudosDave

 

[John F]

Did they have nice big fat chains on or just the usual "wears out in 5 minutes' skinny derailleur type?!

 

[Deleted member 4366]

Did they have nice big fat chains on or just the usual "wears out in 5 minutes' skinny derailleur type?!

I didn't look too close. There were so many of them, that some of them are bound to be good

 

[john h]

Lots to look forward to, hope they keep price down

 

[LEBC Tom]

Lots to look forward to, hope they keep price down

They will be, we're bringing in a crank drive bike that'll sell for 50p.

 

[Jimod]

They will be, we're bringing in a crank drive bike that'll sell for 50p.

Aye but will it go over 25.1 mph?

 

[flecc]

They will be, we're bringing in a crank drive bike that'll sell for 50p.

Any e-bike will sell at 50p.

But will you sell it for that?

 

[john h]

I may hold you to that tom , and take two hundred

 

[trex]

crank drive bikes will always be more expensive than hub bikes.
If you can sell a crank drive for 50p then someone will sell the hub equivalent for 45p.

 

[mountainsport]

They will be, we're bringing in a crank drive bike that'll sell for 50p.

50p per minute to charge a battery for three to four hours is quite a costly task.

MS.

 

[EddiePJ]

The best crank drive would be a silent one.

Until that day though.

 

[paul b]

I am a newbie but wouldnt the speed and power of these drives wear a chainset out very fast ?

 

[Gubbins]

I am a newbie but wouldnt the speed and power of these drives wear a chainset out very fast ?

Interesting comment.. I have done 1500 miles on the original chain with only a small amount of stretch /wear (using the park chain wear tool). I expected it to wear out quickly given the extra strain it's exposed to.

 

[trex]

I am a newbie but wouldnt the speed and power of these drives wear a chainset out very fast ?

yes, it does but chains are cheap and easy to replace. Maybe it's the reason why not many manufacturers put 500W motors on the crank.

john f explores the issue in this thread:

http://pedelecs.co.uk/forum/threads/how-long-should-my-ebike-chain-last.16779/

 

[paul b]

I suppose its how hard you push it trex i wouldnt like the idea of the chain breaking and causing damage

 

[trex]

not so much as breaking but more a case of stretching and wearing. The rear sprockets, especially the smallest sprocket (12 teeth) gets used a lot on flat roads. Average expected lifespan is 1,500 miles for 1% chain stretch. The cost of replacing chain and freewheel is about £15-£20 for Woosh CDs, about £30-£40 for German bikes.

 

[John F]

My CD chain lasted about 700 miles. Rear sprocket also pretty worn. There are a couple of chain manufacturers who produce CD specific chains and seem to promise good life. I plan on checking one of them out this summer.

However as explained above, replacing them fairly often won't break the bank. It just came as a shock to me!

I've also taken to riding in slightly lower gears a lot of the time. I reckon this might put less strain on the transmission? Any views on this strategy anyone?

 

[flecc]

I've also taken to riding in slightly lower gears a lot of the time. I reckon this might put less strain on the transmission? Any views on this strategy anyone?

Doing that is more a matter of less strain on you. There's no difference for the chain since, assuming a single chainwheel, for a given performance it's transmitting the same force at the same linear chain speed

On a hub gear bike it actually increases the strain on the hub gear due to increasing the torque in lower gears.

Fortunately you have a derailleur gear bike, so any torque increase at the rear sprocket is compensated by the increased size of a lower gear rear sprocket, the load spread over more teeth.