just after some advice on going 1x9. I'm building up a 1x9 29er & had assumed I'd need a chain guide like E13's. I'm looking at getting a Salsa 32 tooth chain ring & it mentions that it has raised teeth to prevent the chain from coming off. I'm just wondering if I have the Salsa ring will I need the E13 guide? Anyone else running 1x9 without a guide or with the Salsa ring? I'll be running it with a mid-cage XT derailuer if that makes any difference.