Originally Posted by Finndog
I was thinking about upgrading my OEM shock and going to 120 on my 2012 SuperFly 100AL. I really like the bike but not thrilled with the OEM fork. I would also like to go to 120 (although if this is not a good idea, I'm fine with just upgrading to a good 100 fork). The issue is that the Superfly (like other treks/Gary's) have the G2, 51mm offset. The standard Fox is 46, and I have been told that there is no issue with using the 46 however, it has to have an effect on the Head tube Angle. I don't mind a slightly slacker Head tube (its 70*) but I don't want to change it substantially; I love its climbing ability and quickness. Yeah, it can be a little twitchy on the down. The other option of course is to order a G2 from Fox.
Here's an article saying its fine but I would like to hear other opinions.
thoughts are appreciated.
you head angle does not change by changing the off set your "trail" does. More Trail make a bike more likely to stay straight(effectively feeling slacker) and more nimble under steering(but not leaning) efforts which actually feels effectively like a steeper angle fork.
this is why offset and trail are funny characteristics and how they fit into the overall bike geometery can be extremely hard to simplify it for one I do not know if you lean the bike over or steer it, I have no idea what tires you use, and have a vague idea of your superfly other geometery numbers.
Also by going to longer travel fork upfront you are going to raise your hands up, on my recent experiment I had to take some spacers out from under my stem to make the bike feel normal again. Keep that in mind if you decide to go with a longer travel fork
My experince is this.
on my anthem X 29er(bike that is really similar in scope to the superfly) I trying to dial a 120mm Manitou in before my Kona Honzo frame arrives. The 120mm fork on the Anthem X is for sure a better setup for plowing straight though chunky stuff, but its leaned over turning has for sure been affected in negative way and its got a tiny bit slower when in steered turns. The Manitou has a 48 mm offset though which is just slightly more than the 3 others fork I have had on this bike (Fox Float 100 RL, Marzoricchi 44 TSY 2, RockShox Reba RLTi). The 120 fork does not make this bike more fun. It just make it slower to climb and more ponderous to turn.
the conclusion is that the Reba is the most fun fork this bike, and that my anthem is just not a trail bike. IE that if the Geo is something you are not happy with it might be time to move on to another bike.
curious what dont you like about your stock fork? If it small bump compliance the issue is not the level of Fox fork, its the fact its a fox fork.