How many teeth are your cassette/freewheel?
What are you trying to achieve by going to 30-42-52? I mean of course you are going for higher gearing, but how many gear inch is your top gear?
I assume you are not concerned with your low gear since you suggested going bigger.
44/12 with 27 inch (700c with tires) wheel yields 99 gear inch.
44/11 with 27 inch (700c with tires) wheel yields 108 gear inch.
42/11 with 27 inch (700c with tires) wheel yields 103 gear inch.
Last edited by hermanchauw; 08-01-17 at 11:29 PM.