[Closed] 2 x 8 drivetrain is cross chain a problem

I have never in my entire life had a cross chain problem*. It might not be ideal but as far as i am concerned if it cant be put in any gear combination its faulty and not fit for purpose.

*Excluding where there is a problem cross chaining highlights.

The problem with cross chaining is not that you can't do it, rather that it causes excessive wear.

OP: No idea, sorry :p

Sorry omitted this piece of info. The chain rubs the front derailleur when about 1/2 way through the cassette, I’ve not used a front derailleur since the 90’s so not sure if it’s a set up issue or user issue.

I think it will depend on the chainline in each sprocket. If you have a sprocket that is centered on the cassette (which is how middle ring in a 3x should be), you should be able to use the full width of the cassette. Changing the BB axle width will affect this, so you really need to post pictures of the chainline to know for sure.

AFAIK, front derailleurs are supposed to rub lightly at the extremes of the cassette. Rubbing in the middle of the cassette sounds like something is wrong. It may just need adjusting.

The chain rubs the front derailleur when about 1/2 way through the cassette, I’ve not used a front derailleur since the 90’s so not sure if it’s a set up issue or user issue.

I had to rebuild my 105 drivetrain after front and rear mech lunched themselves, and learned that the tolerances on the front are tiny. It has to be at *just* the right angle, and *just* the right limits, not to rub at some point through the cassette. I couldn't get it perfect - I get rub on about 3/11 sprockets.

Fortunately I also learned that the front shifter has a click *before* changing up the chainring. So pull on the lever as if to shift, but don't quite shift and... there's a click and it's shifted the mech just enough to clear the chainring on the lower half of the cassette.