The Bullit uses a 1.5" headtube. There are also plenty of reducing headsets on the market which allow use of the larger bearings of the 1.5" system along with your 1 1/8 fork. Of course, to get the full benfit of 1.5, use a proper 1.5" steerer fork for a stiffer front end.
Three options: 135x10mm quick release, 150x12mm through axle, and 150x12mm through axle floating brake. You can order them on our online store.
Yes. However there are a couple things you need to know.
If you sustain a heavy enough impact on your guard, it may damage or break the ISCG mount on your frame. If this happens, we will not give you a new frame under warranty. The frame still works, and you can still use a variety of chain guides and bash guards, but you might have to live with crumpled ISCG mounts. This will not effect the integrity of your frame, and we won't hold it against you if you send your frame in for some other reason at some other point in time.
The Bullit uses the ISCG05 interface, so most guides that are sold with these mounts should fit.
Our favorite here is the Gamut Guide, but we have a lot of good experience with the E-thirteen SRS and LG1 as well. Please do not use the "taco" style bashguard with the LG1 or MRP G2 (see the taco FAQ for details). If you want an MRP, we recommend the System 3 ISCG05. Many bottom bracket mount guides should work as well, as well as the various dual-ring guides on the market.
The Bullit uses a 30.9mm seatpost. Make sure you always have it inserted a minimum of 4" (100mm)
34.9mm (supplied with frame)
Nope. Single ring only. Through axle only.
In general, we designed it around the Rockshox Totem single crown fork. The travel (180mm), weight, and general feel are ideal for the majority of Bullit riders. 160mm forks are better for a quicker feel, and certainly better if you are going to do a lot of climbing. The 1.5" Lyric or 36 Van (both 160mm travel) would be excellent choices for all around riding. If you are going to be spending most of your time shuttling, a 200mm dual crown will work great.
8.5" x 2.5" (216x 63mm)
The mounting hardware is 22mm wide with an 8mm through hole.
With the sliding seat tube clamp, you can tune how you want the bike to behave under braking. Lower positioning will provide less anti-squat than moving it higher on the tube. We put a lot of work into designing a clean system- so that you never have to remove the floating link or brake caliper when removing the rear wheel, unlike some other designs.
The Bullit uses a 73mm bb shell, so make sure you always get something compatible with that.
For either of the 150x12mm through axle options, you will want a 56-57.5mm chainline. Our favorite is the Truvativ Holzfeller Howitzer. Get the 73x56 (chainline) bb for this system. Other options are the Raceface Diabolus cranks. You will need the "83mm" version, along with their "68/73mm adaptor kit". If you have old ISIS cranks, use a 73x128mm.
If you are using the 135x10 QR dropouts, you want a 50-51mm chainline. Pretty much any external bearing crankset is available in this size- Truvativ, shimano, etc.
It depends on which dropouts you are using. If you have the 150x12mm dropouts, and the matching wide chainline crankset, you need the Saint M805 top swing, top pull, 34.9mm derailleur. If you are using the 135mm dropouts, just use a typical shimano 34.9, top swing, top pull. The saint front derailleur is not compatible with 50-51mm chainline cranks.
Tires seem to vary so widely these days that we hate to give concrete numbers. 95% of 2.5" tires will fit in there, and definitely any 2.3" tires. We designed the Bullit with short chainstays (for its pivot location and amount of travel), and using a very tall tire (a kenda nevegal 2.7" for instance) can cause interference issues- especially with the DHX air shock.