Can I put a Bosch Gen 4 motor in my gen 3 bike?

[cablepuller1]

Hi,

Looks like my bosch performance line cx gen 3 is knackered and out of warranty, would a gen 4 motor fit in my bike or are all the mounts and connectors different

TIA

 

[Doomanic]

Electronics are the same but the mounts are different.

@Bearing Man will probably be able to fix your motor.

 

[Zimmerframe]

On going thread about the same thing. I take it you mean Gen 2 ?

Anyone ever replaced a CX Gen 2 for the new Gen 4

Quite happy with my current e-mtb but wouldn't mind upgrading the Bosch Gen 2 CX motor for a new Gen 4. Has anyone ever tried this? Easy or difficult?

www.emtbforums.com

 

[Bearing Man]

Hi,

Looks like my bosch performance line cx gen 3 is knackered and out of warranty, would a gen 4 motor fit in my bike or are all the mounts and connectors different

TIA View attachment 57651

Your motor is a Gen 2 and we can probably fix it no problem www.performancelinebearings.com ??

 

[cablepuller1]

On going thread about the same thing. I take it you mean Gen 2 ?

Anyone ever replaced a CX Gen 2 for the new Gen 4

Quite happy with my current e-mtb but wouldn't mind upgrading the Bosch Gen 2 CX motor for a new Gen 4. Has anyone ever tried this? Easy or difficult?

www.emtbforums.com

Thanks, doh I was sure mine was gen3

 

[Zimmerframe]

Thanks, doh I was sure mine was gen3

It's a common mistake .. For MTB's it's generally GEN2 then jump to GEN4 . The Gen 3 was more city bikes and things

 

[cablepuller1]

Thanks, will let you know, warrants has just run out so going LBS first, it's an electronic problem getting 500/503/502 errors, switches on flashes up then switches off, then sometimes switches on okay but no speed, speed sensor seems okay

 

[Bearing Man]

Thanks, will let you know, warrants has just run out so going LBS first, it's an electronic problem getting 500/503/502 errors, switches on flashes up then switches off, then sometimes switches on okay but no speed, speed sensor seems okay

It sounds like it’s got water on the circuit board, if you want any chance of saving it, don’t switch it on again! Especially after being upside down (pcb is at the top). Motor needs stripping and drying if you suspect water could have got in there. Get a warranty decision before opening motor but don’t take too long!

 

[cablepuller1]

It sounds like it’s got water on the circuit board, if you want any chance of saving it, don’t switch it on again! Especially after being upside down (pcb is at the top). Motor needs stripping and drying if you suspect water could have got in there. Get a warranty decision before opening motor but don’t take too long!

Thanks for info, if its the board is it a write off

 

[Bearing Man]

Thanks for info, if its the board is it a write off

60 to 70% of the time it is, but definitely worth a look before writing it off.

 

[cablepuller1]

60 to 70% of the time it is, but definitely worth a look before writing it off.

What happens then, where do I get a new motor?

 

[Doomanic]

You LBS should be able to get one from Bosch.

 

[Bearing Man]

We can get new motors and sometimes have reconditioned motors for people who send in motors we can’t fix.

 

[cablepuller1]

We can get new motors and sometimes have reconditioned motors for people who send in motors we can’t fix.

That's good to know, thanks, will see what happens at LBS

 

[Orinoko]

Send it to Bearing man.
They give amazing service.

 

[Voluptua]

Given that the newer motors are smaller than the old ones, would it be possible to engineer an adapter bracket? Are there published drawings of the mounting arrangements?

Not necessarily for this instance, but to keep things going if the supply of Gen2 motors dies up.

 

[Bearing Man]

It would be simple, but by the time your battery is 8 years old and you pay £900 for a gen 4 motor, plus all the agro of fitting it. Would it really be worth it? In a few years time, ebikes with frame mount batteries will look like penny farthings the speed things are developing. Also, we are hoping to develop a fix for anyone who has sentimental value in their old bike and really wants to keep it ??

 

[Old Mike]

It would be simple, but by the time your battery is 8 years old and you pay £900 for a gen 4 motor, plus all the agro of fitting it. Would it really be worth it? In a few years time, ebikes with frame mount batteries will look like penny farthings the speed things are developing. Also, we are hoping to develop a fix for anyone who has sentimental value in their old bike and really wants to keep it ??

This is absolutely true.

I have a 2017 cube 160 travel ebike, external battery. It looks soooo old compared to the modern bikes.

But then I look soooo old compared to most mountain bikers so it suits me.

If i hadnt wrecked and scratched and crashed it myself (which i have) I still dont think it would be worth much, it just looks like yesterdays technology.

As it is it looks like yesterdays technology thats been ridden and maintained by an idiot.

I dont believe in internal routing of cables. All Hail Monster Tape!!

 

[Wiltshire Warrior]

I cant believe no one hasnt created a adapter to put the new motor in

 

[Bearing Man]

I cant believe no one hasnt created a adapter to put the new motor in

We have been looking at this. We made several brackets but as each bike is different and crank alignment, pedal height, chainring alignment and aesthetics all have to be taken into account, it was never worth the trouble and time.

 

[Planemo]

and sometimes have reconditioned motors for people who send in motors we can’t fix.

How can you recondition it if you can't fix it?

Not trying to be a dick, just a genuine question.

 

[Bearing Man]

How can you recondition it if you can't fix it?

Not trying to be a dick, just a genuine question.

we recondition working motors that we buy and keep to offer people if we can't fix their motor. Then we normally offer a part exchange on their motor, strip it for any usable parts and recycle/scrap whats left.

 

[Planemo]

we recondition working motors that we buy and keep to offer people if we can't fix their motor. Then we normally offer a part exchange on their motor, strip it for any usable parts and recycle/scrap whats left.

Ah, gotcha. So you make a complete reconditioned motor from several other motors, rather than reconditioning just a single, 'non-repairable' motor (which was what threw me).

Cheers.

 

[Bearing Man]

Nope, we buy a motor that may have a bearing failed or no problem at all, but we have to give it a full overhaul just for piece of mind. We try not to mix and match motor parts unless absolutely necessary.

 

[Planemo]

Nope, we buy a motor that may have a bearing failed or no problem at all

We try not to mix and match motor parts unless absolutely necessary.

OK so you do a bit of both then.

It's not a problem, I'm sure glad you guys are around. Was just trying to work out how you got 'reconditioned' motors out of 'unfixable' ones, thats all.