Giant Fathom E+: suspension setup & specs
The Giant Fathom E+ is an e-hardtail with 130–150 mm of fork travel. It is powered by Giant SyncDrive Pro 3X (100 Nm). This page lists the 3 current builds with fork and gives matching starting values for SAG and tyre pressure.
Calculate the setup for your Giant Fathom E+ →
All builds
Fork, motor, weight and price according to the manufacturer. Wheel size: 29.
| Build | Fork | Motor | Weight | RRP | Calculator |
|---|---|---|---|---|---|
| 2 | SR Suntour XCM 34 (130 mm) | Giant SyncDrive Pro 3X (100 Nm) 625 Wh | – | €3,000 | Setup → |
| 1 | Giant STL 36 Air (150 mm) | Giant SyncDrive Pro 3X (100 Nm) 800 Wh | – | €3,600 | Setup → |
| 1 EX | Giant STL 36 Air (150 mm) | Giant SyncDrive Pro 3X (100 Nm) 800 Wh | – | €3,800 | Setup → |
How it compares
With 130–150 mm at the fork, the Giant Fathom E+ sits above average: across the 27 bikes in the “e-hardtail” category in our database, the median is 120 mm. On travel, it slots in between the Giant Talon E+ and the Giant Reign Advanced E+ in the Giant range. The frame is made of aluminium.
At €3,000 for the 2 build, pricing is typical for the category (median €3,150). The top build, 1 EX, costs €3,800. Every build uses a SR Suntour fork. In total, 2 different forks are used, from the SR Suntour XCM 34 to the Giant STL 36 Air. Drive comes from Giant SyncDrive Pro 3X (100 Nm), paired with 625–800 Wh of battery capacity.
Setup notes for this spec
- e-MTB: because of the extra weight, start with slightly more tyre pressure – the surcharge is already built into the table below.
- Hardtail: only the fork needs setting up. With no rear suspension, rear tyre pressure is the key adjustment for comfort and grip.
Target SAG for the Giant Fathom E+
Instead of percentages, this table gives SAG directly in millimetres, measurable with the O-ring on the stanchion. Change the pressure step by step until you reach the value; if Giant gives its own target SAG, use that.
130 mm fork (2)
| Riding style | Fork SAG |
|---|---|
| XC / touring | 17 % = 22 mm |
| Trail | 20 % = 26 mm |
| Enduro / rough | 22 % = 29 mm |
| Bike park | 20 % = 26 mm |
150 mm fork (1, 1 EX)
| Riding style | Fork SAG |
|---|---|
| XC / touring | 17 % = 26 mm |
| Trail | 20 % = 30 mm |
| Enduro / rough | 22 % = 33 mm |
| Bike park | 20 % = 30 mm |
How to measure SAG is explained in our guide SAG setup.
Tyre pressure starting values
The values apply to 2.60″ wide tubeless tyres with a trail casing, including the e-MTB surcharge. With an inner tube add about 0.2 bar (2.9 psi), with an insert take off about 0.1 bar (1.5 psi).
| Ready-to-ride weight | Front | Rear |
|---|---|---|
| 60 kg | 1.40 bar (20 psi) | 1.60 bar (23 psi) |
| 70 kg | 1.52 bar (22 psi) | 1.72 bar (25 psi) |
| 80 kg | 1.64 bar (24 psi) | 1.84 bar (27 psi) |
| 90 kg | 1.76 bar (26 psi) | 1.96 bar (28 psi) |
| 100 kg | 1.88 bar (27 psi) | 2.08 bar (30 psi) |
| 110 kg | 2.00 bar (29 psi) | 2.20 bar (32 psi) |
| 120 kg | 2.12 bar (31 psi) | 2.32 bar (34 psi) |
Air pressure in the fork
You will find a suitable starting pressure on the sticker on the fork stanchion or in the suspension manufacturers’ setup charts. Our calculator gives you a starting value including rebound for your weight and riding style. What matters afterwards is the measured SAG from the table above.