I have an OK chainline, around 48, which should be enough according to Blackspire documentation. But even if I would go up to 50, would that be enough? How thick is the backplate of a Stinger?

According to Google, there seems to be quite a lot of people out there with problems similar to mine?

Btw, check out the dust!

Something’s not right there!

What crank/bb system have you got there?

Looks like you’re missing some spacers on the drive side.

If thats a square taper chainset the taper could be flared. I had a similar issue with a Middleburn RS7. Middleburn replaced it for me.

If its not a square taper I have no idea 😆

There’s more than one? 🙂 I’m running square taper. 113mm.

EDIT: Wow, people are fast here. Yeah it’s SQ. So that replacement fixed it for you?

I thinned the part of the plate that goes between the bb cup and the frame on my Stingers down with a grinder as I’m using them with old-fashioned square-tapered BBs -which allegedly shouldn’t work 😉

I also fitted a shorter bb axle to one of the bikes.

If it is flared the only thing you could do is replace the arm or run a longer BB to space the arm further away from the BB.

Could try a 115mm BB or a 118mm but that might throughout the chain line.

That said if its running so close to the BB that could be an issue anyway.

115mm is probably optimal for chainline, but I don’t really know where to get hold of one. And the question remains, would those extra 2mm be enough?

The arm is brand new btw, and the same distance out from centre as non drive side.

Should probably get one of those Bionicon guides instead.

edit: I have a 73 shell btw, 68 x 115mm is pretty easy to get hold of.

I remember running a 121mm square taper to fit chain guides in. No idea if you can still get them.