2.5" is about the max.
8.5" x 2.5" (216x 63mm)
The mounting hardware is 22mm wide with an 8mm through hole.
Anything between 140mm and 160mm is ideal. 140mm forks will give the bike a more xc feel, with quicker handling and lighter weight. Using a 160mm fork will have a more "all mountain" feel and a more confidence inspiring ride on technical trails.
1 1/8"
The Heckler uses a 30.9mm seatpost. Make sure it is always inserted a minimum of 4" (100mm)
34.9mm (supplied with frame)
A shimano 34.9 top swing/ top pull. Anything but saint should do the job
The Heckler uses a 73mm bottom bracket shell, and a 50-51mm chainline. Pretty much any of the newer external bottom bracket cranks will mount up without issue. The Truvativ stylo and shimano Deore XT are our favorites. If you are using an ISIS setup, you need a 73x113mm bottom bracket.
We recommend a 160mm or 185mm rotor, but a 203 will fit in there if you wish.
Our favorites are the E-thirteen guides (LG1, STS, DRS) and Gamut models. There are no ISCG mounts on the Heckler, so you will need an ISCG adaptor or a bb mount guide.
Any standard 135x10mm hub will do the trick.