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Rule of thumb SS-gearing 26 to 27.5 to 29?

Uphiller

Chimp
Jul 24, 2002
16
0
Is there an easy way to equate gear ratios between different wheel sizes. I'm looking for a simple rule of thumb, not a forumula. If I'm running a 34 up front on a 26" and a 32 up front on a 29", what cogs would give the same ratio on back for both? Or better yet, any way to simply calculate/know the amount of gain?
 

I_Bike_Alone

Chimp
Aug 7, 2008
2
0
there's an awesome gear ratio calculator on here somewhere, try google it might come up

i think in general you had to add 1.5 teeth in back when going from a 26 to 29 with the same crank