Hello,
I run a single 42t front and 9spd rear on my norco bigfoot hardtail
I have been running a Blackspire IST-1 buts it not that great to be honest, drops the chain and doesnt add much tension to the chain as the arm is to chunky to be adjusted past the chainstay.
I just tried a truvativ box guide which looks great, very adjustable etc but my chainring rubs on the chainstay?
Can anyone suggest a similar product to the truvativ that would fit my bike?
Or how to overcome the spacing issue with the one i have now?

Thanks
p.s its bb mounted