BMC Fourstroke AMP LT: suspension setup & specs
The BMC Fourstroke AMP LT is an e-MTB for trail and touring with 120 mm of fork travel and 120 mm at the rear. It is powered by TQ HPR60. This page lists the 2 current builds with fork, shock and shock size and gives matching starting values for SAG and tyre pressure.
Calculate the setup for your BMC Fourstroke AMP LT →
All builds
Fork, shock, shock size (eye-to-eye length × stroke) and rear travel, motor, weight and price according to the manufacturer. Wheel size: 29.
| Build | Fork | Shock | Shock size | Rear travel | Motor | Weight | RRP | Calculator |
|---|---|---|---|---|---|---|---|---|
| One | RockShox SID Select+ 3P (120 mm) | RockShox SIDLUXE Select+ 3P | – | 120 mm | TQ HPR60 360 Wh | 16.3 kg | – | Setup → |
| Two | RockShox SID 3P (120 mm) | RockShox SIDLUXE Select+ 3P | – | 120 mm | TQ HPR60 360 Wh | 17.3 kg | – | Setup → |
How it compares
With 120 mm of fork travel, the BMC Fourstroke AMP LT is on the shorter side; the median of the 101 comparable bikes in the “e-MTB for trail and touring” category is 150 mm. Front and rear both work with 120 mm of travel. BMC builds the frame from carbon.
The lightest build, One, weighs 16.3 kg according to BMC – about 7.1 kg less than the category median (23.4 kg across 49 bikes with a stated weight). Within the range, weight varies by 1.0 kg. Fork and shock come from RockShox on every build. The fork line-up ranges from the RockShox SID Select+ 3P to the RockShox SID 3P. It is powered by TQ HPR60 with a 360 Wh battery. BMC specifies a maximum system weight of 110 kg. Subtracting roughly 18 kg for the bike leaves about 92 kg for rider, clothing, backpack and luggage.
Setup notes for this spec
- Air fork (RockShox SID Select+ 3P): the air valve is on top of the left leg under a cap. Change pressure in small steps (about 5 psi (0.34 bar)) and cycle the fork a few times afterwards so the air chambers can equalise.
- Rebound: turn the red RockShox adjuster fully closed first and count clicks from there – that way you can note settings and restore them later.
- Air shock (RockShox SIDLUXE Select+ 3P): measure SAG in your riding position, ideally with a helper holding the bike. Cycle the shock a few times after every pressure change.
- e-MTB: the extra weight mainly affects tyre pressure, which is why the table below already includes a surcharge. SAG is measured just as on a bike without a motor.
Target SAG for the BMC Fourstroke AMP LT
Instead of percentages, this table gives SAG directly in millimetres, measurable with the O-ring on the stanchion and on the shock shaft. Change the pressure step by step until you reach the value; if BMC gives its own target SAG, use that.
120 mm fork (all builds)
| Riding style | Fork SAG |
|---|---|
| XC / touring | 17 % = 20 mm |
| Trail | 20 % = 24 mm |
| Enduro / rough | 22 % = 26 mm |
| Bike park | 20 % = 24 mm |
How to measure SAG is explained in our guide SAG setup.
Tyre pressure starting values
Basis: 2.40″ tyre width, tubeless, trail casing, including the e-MTB surcharge. If you run tubes, add about 0.2 bar (2.9 psi); with an insert, about 0.1 bar (1.5 psi) less is enough. Stock tyres: Maxxis Rekon 2.4" WT | EXO TR.
| Ready-to-ride weight | Front | Rear |
|---|---|---|
| 60 kg | 1.48 bar (21 psi) | 1.68 bar (24 psi) |
| 70 kg | 1.60 bar (23 psi) | 1.80 bar (26 psi) |
| 80 kg | 1.72 bar (25 psi) | 1.92 bar (28 psi) |
| 90 kg | 1.84 bar (27 psi) | 2.04 bar (30 psi) |
| 100 kg | 1.96 bar (28 psi) | 2.16 bar (31 psi) |
| 110 kg | 2.08 bar (30 psi) | 2.28 bar (33 psi) |
| 120 kg | 2.20 bar (32 psi) | 2.40 bar (35 psi) |
Air pressure in the fork and shock
The sticker on the fork (or on the shock) and the manufacturers’ setup charts give you a first pressure. Our calculator is more precise and suggests rebound too – always check the result via SAG.