Marzocchi Bomber Z1 setup
Most Bomber Z1s leave the shop set for someone else. Put in your weight for your starting numbers, straight from Marzocchi’s own charts.
Pump to 76 psi, then measure sag and adjust.
Compression, spacers and limits
- Compression: Lever fully OPEN to start. It sweeps between OPEN and FIRM with no clicks.
- Rebound: Turn the dial fully clockwise until it stops, then count the clicks back out. The dial is under the damper-side leg.
- Volume spacers at 160 mm: ships with 2, max 7.
- Max pressure 120 psi.
- Source: Marzocchi Bomber Z1 owner’s guide 605-00-311 (RAIL, 2024+) and tuning guide 605-00-256 (GRIP)
Fix what you feel
Tap what your fork does. Fixes are for your RAIL. Change one thing at a time, then ride the same section again.
Harsh over roots and braking bumps
Too much air, or the compression lever is too far toward FIRM.
- Check sag first. Under 15% means too much air.
- Make sure the compression lever is fully OPEN.
- Rebound too slow can feel harsh too. Open it 1 or 2 clicks (counter-clockwise).
Dives under braking and on steep roll-ins
Too little compression support, or too much sag.
- Move the compression lever a small step toward FIRM, about a quarter of the way. It has no clicks.
- Still diving and sag is past 20%? Add 3 to 5 psi.
Bottoms out hard on drops and big landings
The air spring isn’t ramping up enough.
- Add one volume spacer.
- Stay within Marzocchi’s max spacer count for your travel.
- The lever only firms up the start of the stroke, so it won’t fix a hard bottom-out.
Never uses full travel, even on big hits
Too many spacers, or too much air.
- If sag is right, remove one volume spacer.
- Make sure the compression lever is fully OPEN.
Bouncy, or clunks at full extension
Rebound is too fast.
- Add rebound 1 or 2 clicks (clockwise).
Rides lower and lower through rough sections
Rebound is too slow, so the fork packs down.
- Open rebound 2 clicks (counter-clockwise).
Tell Suspend how it felt and it gives you the exact click to change on your Marzocchi Bomber Z1. Free for your first bike.
Full Marzocchi Bomber Z1 reference
For the air-sprung Bomber Z1, 2019 onward. The 2024-and-newer redesign has the RAIL damper, and the 2019 to 2023 fork has GRIP. Marzocchi’s pressure, rebound and spacer numbers are identical for both. The coil Z1 uses spring rates, not pressure, so this page does not apply to it. The newer Bomber Z (150 to 190 mm, 3-position lever) and the Super Z have their own charts.
Marzocchi Bomber Z1 air pressure chart
| lb | kg | psi |
|---|---|---|
| under 130 | under 59 | 55 |
| 130–140 | 59–64 | 59 |
| 140–150 | 64–68 | 63 |
| 150–160 | 68–73 | 67 |
| 160–170 | 73–77 | 72 |
| 170–180 | 77–82 | 76 |
| 180–190 | 82–86 | 80 |
| 190–200 | 86–91 | 85 |
| 200–210 | 91–95 | 89 |
| 210–220 | 95–100 | 93 |
| 220–230 | 100–104 | 97 |
| 230–240 | 104–109 | 102 |
| 240–250 | 109–113 | 106 |
psi. Source: Marzocchi Bomber Z1 owner’s guide 605-00-311 (RAIL, 2024+) and tuning guide 605-00-256 (GRIP).
Marzocchi Bomber Z1 rebound clicks by weight
| lb | RAIL | GRIP |
|---|---|---|
| under 130 | 13 | 13 |
| 130–140 | 12 | 12 |
| 140–150 | 11 | 11 |
| 150–160 | 10 | 10 |
| 160–170 | 9 | 9 |
| 170–180 | 8 | 8 |
| 180–190 | 7 | 7 |
| 190–200 | 6 | 6 |
| 200–210 | 5 | 5 |
| 210–220 | 4 | 4 |
| 220–230 | 3 | 3 |
| 230–240 | 2 | 2 |
| 240–250 | 1 | 1 |
Turn the dial fully clockwise until it stops, then count the clicks back out. The dial is under the damper-side leg. Push the fork down hard and let go. If it clunks at full extension, rebound is too fast.
Marzocchi Bomber Z1 sag in millimetres
| Travel | 15% (firm) | 20% (plush) |
|---|---|---|
| 130 mm | 19.5 mm | 26 mm |
| 140 mm | 21 mm | 28 mm |
| 150 mm | 22 mm | 30 mm |
| 160 mm | 24 mm | 32 mm |
| 170 mm | 26 mm | 34 mm |
| 180 mm | 27 mm | 36 mm |
Measure with the compression adjusters fully open, dressed to ride, weight spread across saddle, bars and pedals.
Marzocchi Bomber Z1 compression settings
| Damper | Start at |
|---|---|
| RAIL | Lever fully OPEN to start. It sweeps between OPEN and FIRM with no clicks. |
| GRIP | Lever fully OPEN to start. It sweeps between OPEN and FIRM with no clicks. |
Marzocchi Bomber Z1 volume spacers
| Travel | Ships with | Max |
|---|---|---|
| 180 mm | 1 | 5 |
| 170 mm | 1 | 6 |
| 160 mm | 2 | 7 |
| 150 mm | 3 | 7 |
| 140 mm | 4 | 8 |
| 130 mm | 5 | 8 |
Spacers change how hard the fork ramps up at the end of its travel, not its sag. Add one if you bottom out too easily, remove one if you never get near full travel. Never go over Marzocchi’s max for your travel.
Which Marzocchi Bomber Z1 damper do I have?
- RAIL: One compression lever that sweeps between OPEN and FIRM with no clicks, plus a rebound dial under the damper-side leg.
- GRIP: The same sweep lever and rebound dial as RAIL. On the 2019 to 2023 forks the lever is labelled GRIP.
The redesigned 2024-and-newer Z1 (36 mm chassis) ships with RAIL. The earlier 2019 to 2023 Z1 has GRIP.
Marzocchi Bomber Z1 service interval
Marzocchi recommends a full service every 125 hours of riding or once a year, whichever comes first.
Questions
What air pressure should I run in my Marzocchi Bomber Z1?
Start from Marzocchi’s chart for your riding weight with gear. A 170–180 lb rider starts at 76 psi. Then set sag to 15–20%. Never go over 120 psi, and never below 40.
How much sag should a Bomber Z1 have?
15–20% of travel: 24–32 mm on a 160 mm fork. Measure with the compression lever fully OPEN, dressed to ride, with your weight spread across saddle, bars and pedals.
How many clicks of rebound on a Bomber Z1?
It depends on your weight. From fully closed, a 170–180 lb rider starts at 8 clicks out. Lighter riders run more clicks out: 13 at 120–130 lb, down to 1 at 240–250 lb.
Does this work for my older Bomber Z1?
For the air Z1 from 2019 on, yes. Marzocchi’s numbers are the same for the GRIP and RAIL dampers. The coil Z1 sets up by spring rate instead, and the newer Bomber Z and Super Z have their own charts.
Related guides
Sources · last checked 2026-10-09
- Marzocchi Bomber Z1 owner’s guide 605-00-311 Rev B, 2024 RAIL fork (bike.marzocchi.com)
- Marzocchi Bomber Z1 and DJ tuning guide 605-00-256 Rev B, 2019–2023 GRIP fork (bike.marzocchi.com)
- Marzocchi 2021 fork owner’s guide 605-00-255 (service interval)
- Marzocchi Bomber Z1 product page (RAIL damper, travels)
- Vojo Mag: new Bomber Z1 announced 18 April 2024 with RAIL (damper-by-year only)
Starting points from the manufacturer’s charts, not a substitute for your fork’s manual. Always confirm with a sag measurement and stay under the max pressure.