Not so long ago i bough a fx 7.4. When i bought it, my LBS was out of stock in my size so i ended up getting a small 17.5 ( i should be 20 inch) as a looner for 2/3 weeks, the time for the store to get the medium version. Turns out now that trek is out of 2014 fx 7.4 for this seasson. I am now faced with the choice of either keeping the fx 7.4 in size small or upgrade to a 7.5 fx in the correct frame size... for about 200 $CAN more.
I don't mind the small frame, in fact i think (after testing the 7.3 and the 7.2 in medium size) that i prefer a small frame as it feels safer (my feet can reach the grounds while i am on the bike).
I am tempted to upgrade, mainly for the isoframe ( my neigbourghood has very bumpy roads) but i have some concerns about the change in drivetrain and i am not knowledgeable to clearly understand the differences. All i read so far is that the gearing in the fx 7.5 makes it closer to a road bike than fx 7.4...
1 - what are the implications of moving from shemano acera on the fx 7.4 to the sora ? would that make climbing hill any harder/eaiser ? or maybe the top speed ? should i even worry about this ?
2- Is the 7.5 a less versatille bike than the 7.4 ?
3 - How wide of a tire can the 7.5 fit ?
4 - Any other comment on the difference between the two ?
Drivetrain fx 7.5 fx 7.4
Shifters Shimano R440, 9 speed Shimano Acera, 9 speed
Front derailleur Shimano Sora Shimano Acera
Rear derailleur Shimano Deore Shimano Deore
Crank FSA Vero, 50/34 (compact) Shimano Acera M391, 48/36/26 w/chainguard
Cassette SRAM PG-950 11-34, 9 speed Shimano HG20 11-32, 9 speed
Pedals Nylon body w/alloy cage Nylon body w/alloy cage