AC1 Tech Reference
Geometry, rear travel for every shock, torque specs, assembly compounds, bearings and Pinion wiring for every AC1, in one place. Made for owners who work on their own bikes.
Updated October 2026
Geometry
Pick a bike type and rear end. Only chainstay length and wheelbase change with the rear end.
AC1 type
Rear end
Swipe sideways to see every size.
Travel and shock options
Pick your rear end to see the rear travel each shock gives and which AC1 type it suits.
Rear end
All rear ends
| Shock | MX | MX+ | 29 |
|---|
Rear wheel travel in mm. Shock sizes are eye to eye x stroke. Suggested type: Trail up to 164 mm, Enduro 165 to 188 mm, DH over 188 mm. Filled tags mark our standard shock for each type: Trail 210 x 50; Enduro 230 x 57.5 on MX, 210 x 55 on MX+ and 29; DH 250 x 70 (225 x 70 below S3). Each shock length uses its own set of shock plates, and swapping them takes 4 bolts. 250 length shocks fit frames S3 and larger; smaller frames use the 225 length shock with the same stroke.
Upgrades for existing AC1s
Three updates we're rolling out to bikes already on the trail.
Side platesFree
Stainless plates welded on near the head tube. They nearly double the lifespan of the frame.
The work takes 1 to 2 days at the shop. Out-of-town owners can ship the frame in.
Solid lower rocker axleFree
Some early batches shipped with a hollow lower rocker axle. It's fine in most cases, but we'll send you a solid one for free.
Not sure which you have? Email us your name and we'll check your build records.
LT Link
The long travel rocker link gets more rear travel from the same shock. See Travel and shock options above for every shock size.
It uses different lower rocker bearings, listed under Bearings.
To book side plates, request an axle or order an LT Link, email info@archibaldcycles.com.
Assembly compounds
Select a compound in the table to see every place it goes.
| Compound | Application | Callouts | |
|---|---|---|---|
| 1 | Anti-seize | Apply to surface | 10 |
| 2 | Grease | Apply to surface | 6 |
| 3 | Loctite 243 (blue) | Apply to threads | 15 |
| 4 | Loctite 638 (green) | Apply to surface | 2 |
Swipe sideways to see the whole drawing.
Front triangle torque specifications
Fastener torque for the front triangle and gearbox mount.
*When tightening the gearbox mounting bolts, tighten the side without sliding bushings first. This locates the gearbox in the frame and sets the reference for chainline.
Swipe sideways to see the whole drawing.
Rear triangle torque specifications
Fastener torque for the rear triangle and seatstay pivots.
*When tightening the seatstay pivot bolts, hold the 4 mm side stationary and tighten to spec from the 6 mm side (non-drive side). This prevents the 4 mm bolt from stripping.
**Bolt head is accessible from the non-drive side of the bike.
Swipe sideways to see the whole drawing.
Bearings
What to order when servicing the AC1 pivots.
| Location | Bearing | Size (ID x OD x W) | Qty |
|---|---|---|---|
| Main pivot | Enduro 6003 | 17 x 35 x 10 mm | 2 |
| Upper rocker pivot | Enduro 3801 LLU MAX | 12 x 21 x 8 mm | 2 |
| Lower rocker pivotStandard link | Enduro DR 11197 LLU MAX BO | 11 x 19 x 7 mm | 4 |
| Lower rocker pivotLT link | Enduro 3802 LLU MAX | 15 x 24 x 7 mm | 4 |
| Tensioner pivot | Enduro 6902 | 15 x 28 x 7 mm | 2 |
| Tensioner pulley | Enduro S6000 (stainless) | 10 x 26 x 8 mm | 1 |
| Idler pulley | Enduro 6902 Solid Lube | 15 x 28 x 7 mm | 1 |
| Other pivot service parts | |||
| Shock eyes | Enduro needle bearing kit, sized to your shock | ||
| Dropout pivot | IGUS bushing (no bearing) | ||
Full set, standard link
2x 6003
2x 3801 LLU MAX
4x DR 11197 LLU MAX BO
2x 6902
1x S6000 (stainless)
1x 6902 Solid Lube
Full set, LT link
2x 6003
2x 3801 LLU MAX
4x 3802 LLU MAX
2x 6902
1x S6000 (stainless)
1x 6902 Solid Lube
Your link type decides which lower rocker bearing you need. Quantities are per bike.
Pinion battery and wiring
How the Smart Shift battery mounts and where the cables run.
- The battery mounts just above the gearbox on two brackets.
- The brackets also route the wiring into the downtube, through a large port with a rubber cover.
- Inside the downtube the cables run in a silicone sleeve.
- The shifter cable exits near the head tube.
Every Smart Shift build comes with the brackets, port cover, sleeve and photo instructions.
Questions about your AC1? Email info@archibaldcycles.com.