# Thread: How will 120mm fork, anglset headset, and G2 geometry fork play on Mach 4?

1. ## How will 120mm fork, anglset headset, and G2 geometry fork play on Mach 4?

Here's my scenario.
I've purchased a 2011 Mach 4.
It has a standard HT angle of 70.8 with the 100mm fox fork with 470.9 ac

I'm gonna make two changes.

1. I'm going to use a 120mm fork.
2. I'm going to use the Cane Creek Angle set, which can change the HT angle by 1.5

What I'm trying to figure out is how those two mods will interact with a G2 fork (which I've found a great deal on).

With the orginal angle at 70.8, adding 20mm of AC will change the angle to ≈69.8. Then if I adjust the angleset to -1.5° would bring the HTA to ≈68.3. I'm comfortable with that. How do you guys see the G2 geometry of the fork affecting handling. The way I'm looking at is that the slacker head angle will slow down the steering and the G2 geometry will counter that to some degree.

What do you guys think?

Anyone ever put a G2 fork on a standard bike?

thanks for any input.

2. I knew a guy who put a G2 fork on a Stumpjumper. Surprisingly his bike did not spontaneously explode.
The only difference between the G2 fork and a regular fork is that the legs are put out further in front of the bike. It should not affect the head angle BUT will lengthen the bike a bit.

3. Originally Posted by the-one1
Surprisingly his bike did not spontaneously explode.

4. ^^^^^ Nice.

Originally Posted by the-one1
I knew a guy who put a G2 fork on a Stumpjumper. Surprisingly his bike did not spontaneously explode.
The only difference between the G2 fork and a regular fork is that the legs are put out further in front of the bike. It should not affect the head angle BUT will lengthen the bike a bit.
My understanding is that the crown is pushed forward, but the axle is in the same position.

5. Found this while searching mtbr:
46mm offset fork has more trail and is more stable with heavier steering

51mm offset (G2) has less trail, less stability and lighter steering
Looks like chumbacabra is correct.

6. Originally Posted by GhisalloWheels
Here's my scenario.
I've purchased a 2011 Mach 4.
It has a standard HT angle of 70.8 with the 100mm fox fork with 470.9 ac

I'm gonna make two changes.

1. I'm going to use a 120mm fork.
2. I'm going to use the Cane Creek Angle set, which can change the HT angle by 1.5

What I'm trying to figure out is how those two mods will interact with a G2 fork (which I've found a great deal on).

With the orginal angle at 70.8, adding 20mm of AC will change the angle to ≈69.8. Then if I adjust the angleset to -1.5° would bring the HTA to ≈68.3. I'm comfortable with that. How do you guys see the G2 geometry of the fork affecting handling. The way I'm looking at is that the slacker head angle will slow down the steering and the G2 geometry will counter that to some degree.

What do you guys think?

Anyone ever put a G2 fork on a standard bike?

thanks for any input.
Did you ever do this, and if so, how did it work out for you? I'm thinking of doing the same thing, minus the angle set, for my wife's bike. I'm looking to up the front travel without slowing the steering too much...

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