As a general aesthetic point, bikes look more 'racy' with a steep converging angle on the chain, and this depends on the difference between chain and sprocket, not the ratio. So, 50/15 looks more racy than 40/12, even though they are exactly the same ratio.
As a general aesthetic point, bikes look more 'racy' with a steep converging angle on the chain, and this depends on the difference between chain and sprocket, not the ratio. So, 50/15 looks more racy than 40/12, even though they are exactly the same ratio.