I haven't worked much with chains, so forgive my ignorance. I bought a 45 tooth rear and a new 14 tooth front. I'm ordering a new chain and I think I need a 120 link. I'd like to have the flexibility to easily go back to a 50 tooth rear, so I'm wondering if I order a 122 link, will the snail adjusters provide enough adjustment to go back and forth without removing or adding links? Or is that not what the snails are intended for? Or is it just a bad idea? I'm ordering an X Ring and I'm hoping it won't stretch much. Thanks and cheers.