I haven't gone any larger than a standard modern road chainring, 53t with a 16t and 17t cog. Accelerating from stops takes some technique, but can be done to get some nice jack rabbit starts if your legs are strong enough.

These days I'm planning on dropping to a custom 50t track chainring with a 16t cog on my Switch and a 53t with a 17t cog on my Leader, both roughly 82 GI.

EDIT: Holy high gear Batman! 49x13 is 102 GI, that's pretty huge from the streets Bro.