Bosch Gen 3 Chain guide

redshit

New Member
Oct 22, 2021
1
0
Wales
Hey folks, I've a Cube Reaction Hybrid performance 500 with a bosh gen 3 motor.

I've had issues with the chain jumping off when changing through gears quickly and on rough terrain so I was considering a chain guide. I've noticed the Gen 3 appears to have bolt holes for attaching a chain guide but not sure if it meets any particular standard or if anyones had luck fitting one?

cheers
 

Whitey

Member
May 3, 2021
17
9
Sussex, UK
Hey folks, I've a Cube Reaction Hybrid performance 500 with a bosh gen 3 motor.

I've had issues with the chain jumping off when changing through gears quickly and on rough terrain so I was considering a chain guide. I've noticed the Gen 3 appears to have bolt holes for attaching a chain guide but not sure if it meets any particular standard or if anyones had luck fitting one?

cheers

Did you have any joy?
This is something I want to sort too.....
 

Whitey

Member
May 3, 2021
17
9
Sussex, UK
So. I’ve fitted one whilst doing a new chain and rear cogs.

Found a E-Thirteen espec Bosch chainguide on eBay, removed from a new bike for £12.

I did have to rub the inner edge of the guide down by 1-2mm to stop chain rub in first gear, but other than that, seems ok.

143EB95B-9AEA-47A2-9BE5-F5685923DC8A.jpeg
 

Headshrinker

New Member
Sep 22, 2022
4
0
Scotland
So. I’ve fitted one whilst doing a new chain and rear cogs.

Found a E-Thirteen espec Bosch chainguide on eBay, removed from a new bike for £12.

I did have to rub the inner edge of the guide down by 1-2mm to stop chain rub in first gear, but other than that, seems ok.

View attachment 98642
Ah, ok, I didn't think those holes were threaded?
Did you have to take the chain ring off?
Ive actually fitted a new derailleur with a clutch now and its made a massive difference, Id quite like to fit a chain guard too though.
 

Whitey

Member
May 3, 2021
17
9
Sussex, UK
Yerr they’re M4, got a few from ebay 10mm long.
You don’t have to remove the chain ring, but I did originally to check the M4’s.
What derailleur did you go for?
 

Headshrinker

New Member
Sep 22, 2022
4
0
Scotland
Yerr they’re M4, got a few from ebay 10mm long.
You don’t have to remove the chain ring, but I did originally to check the M4’s.
What derailleur did you go for?
cheers, Ill take a look.

I went for the microShift 9 speed with clutch, changed the cassette and shifters too.
Didn't realise how much the chain moved around till I upgraded, barely any noise now going over rough terrain whereas before it sounded like a bag of spanners and my chain always came off.
 

Headshrinker

New Member
Sep 22, 2022
4
0
Scotland
Yerr they’re M4, got a few from ebay 10mm long.
You don’t have to remove the chain ring, but I did originally to check the M4’s.
What derailleur did you go for?
Is yours definitely a gen3?
I’ve just checked and the holes on mine are definitely not threaded.
There doesn’t even seem to be space to fit a chain guide.
To make matters worse, I’ve cracked the plastic chainring protector that clips onto the chainring.
 

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