Chainline on hybrids with 135mm spacing

[Brian73]

I've recently bought 2 second hand chainsets

Truvativ Touro Powerspline 36/50 and Samox AF11 34/46 Square Taper

Both came off hybrids, the Truvativ came from a Boardman and the Samox a Genesis Vapour CX

Both came with 68mm x 113mm bottom brackets, but the manufacturer specs 108mm for both the chainsets

I'm guessing they used 113mm to account for the the extra 5mm from 130 to 135mm rear spacing that the hybrids use

Is this correct?

I'm fitting these chainsets to standard road bikes with 130mm rear spacing so reducing the BB by 5mm should give a 43.5mm Shimano standard chainline

[531colin]

Chainline is going to be governed by the front mech. that you intend to use. (Road or MTB)
As you have the "original" BB units, I would assemble the chainset(s) on them and see what chainline you get, then you will know where to go from there to line up with the F. mech. you want to use.

[Valbrona]

Can't think why a hybrid would be 135mm unless it has disc brakes.

[Brian73]

135mm seems pretty standard now for hybrids and touring bikes, disc brakes or no disc brakes , larger clearances allows for bigger tyres.

[Brucey]

135mm seems pretty standard now for hybrids and touring bikes, disc brakes or no disc brakes , larger clearances allows for bigger tyres.

yup, and stronger rear wheels, and allows the manufacturers to use (more 'commoditised') MTB-based transmissions. There are a few 'flat barred road bikes' (which accept skinny tyres only) which are built 130mm at the rear but pretty much everything else 'hybrid' is built 135mm.

BTW I don't mind running a 'road' chainline onto a 135mm rear end; biasing the chainline towards the hardly-used 11T sprocket at the expense of the chainline in bottom gear seems a poor choice to me....

cheers