Bosch gen 4

[Morpheous]

Can anyone tell me what the “boost“ bit means with respect to Bosch gen 4 motors please?

I want to put an aftermarket fsa spider on so I can use a wolftooth chainring - just want to get the correct spider

Cheers Alll

 

[Doomanic]

Boost refers to to the axle size and consequently chain line.

 

[Doomanic]

FSA Bosch Ebike Spider G4 Steel 104mm bcd Black

FSA Bosch Ebike Spider G4 Steel 104mm bcd Black. Replacement forged steel spider compatible with Bosch Gen 4. 104mm BCD with chainline 1x C.L - 50mm (W0146), 1x C.L - 53mm (W0147)

shop.windwave.co.uk

 

[Morpheous]

FSA Bosch Ebike Spider G4 Steel 104mm bcd Black

FSA Bosch Ebike Spider G4 Steel 104mm bcd Black. Replacement forged steel spider compatible with Bosch Gen 4. 104mm BCD with chainline 1x C.L - 50mm (W0146), 1x C.L - 53mm (W0147)

shop.windwave.co.uk

Thanks very much - would you happen to know if the Cube stereo hybrid 140 HPC is boost or non-boost?

Cheers

 

[Doomanic]

It's almost certainly Boost, but it should say on your axle. If it's Boost the rear axle is 148mm and the front is 110mm.