Yep, it will be cheaper. And if you're looking for a 2 tooth rear adjustment anyway (not fine-tuning with a 1 tooth change), then 1 down on the front will be fine. Almost all racebikes have a 15t front, and many have a 14t. Personally, I'm running a 15t for the Creek, and change to a 14t (same rear) for Wakey/Broadford/Winton.
Also re the chain length, whenever I buy a chain from Motomummy or the like, they always come in the 120 link version, and I don't remove 8 links, so I don't think a 112 will be long enough anyway.
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