The DVO Diamond D1 platform is a good example of a fork that rewards riders who care about support, traction, and tuneability rather than just chasing the lightest possible front end. In this article I break down what the current Diamond 36 D1 SL actually is, how its damping package works, how to set it up for mixed trail riding, and where it makes sense in a UK build. I’m also calling out the trade-offs, because that is the part many buyers skip and later regret.
What matters most before you buy or set one up
- The current Diamond 36 D1 SL is a 29er fork with a 36 mm chassis, 140-160 mm travel, and a 15x110 Boost axle.
- Its tuning is built around air pressure, sag, rebound, high-speed compression, low-speed compression, and volume spacers.
- For UK trail riding, it makes the most sense on aggressive trail and light enduro bikes where grip and control matter more than minimum weight.
- The fork is priced as a premium trail option, but it is still less specialised than a full downhill fork.
- Maintenance is straightforward if you respect the service intervals and keep the lowers and air spring in good condition.
What the fork actually is
The current Diamond 36 D1 SL sits in that useful middle ground between a classic trail fork and something more hard-hitting. DVO has moved the platform to a 36 mm chassis, a redesigned crown with better knob clearance, and a more modern damper layout, so the fork feels aimed at riders who want composure in rough sections without stepping all the way into enduro-race bulk. It is a 29er fork, it uses a 15x110 Boost axle, and the spec sheet puts it at 140-160 mm travel with a 180 mm direct-mount brake interface.
That matters because the fork is not trying to be everything at once. It is built for real trail speed, braking loads, and repeated hits, but it is still a front end you can live with on long rides. If you are looking at a used fork, do not assume every Diamond label means the same thing either: older Diamond generations were tuned around a different philosophy, while the current 36-series leans much more on conventional air-spring and damper adjustment. That difference is exactly why setup deserves its own section.
How the tuning works in real use
DVO’s own Diamond 36 setup guide frames the fork around 15-30% sag, with the air system doing the heavy lifting for ride height and support. In practice, that gives you a broad range: you can run it more plush for grip on slippery ground, or firmer for a bike that is being pushed hard into berms, compressions, and braking zones. The guide also sets a maximum air pressure ceiling of 100 psi on the Diamond 36, so I would treat pressure changes as small, deliberate steps rather than a brute-force fix.
| Adjustment | What it changes | What I look for on the trail |
|---|---|---|
| Air pressure and sag | Spring rate and ride height | Enough support to hold the bike up, enough sag to keep the front tyre working |
| Rebound | How fast the fork returns after a hit | No kickback, no packing down on repeated roots or braking bumps |
| Low-speed compression | Support under body movement and braking | Less dive without turning the fork harsh |
| High-speed compression | Control on bigger, faster impacts | Less spike on square edges and landings, but not so much damping that the fork refuses to use travel |
| Volume spacers | End-stroke ramp-up | More bottom-out resistance once sag is already correct |
Air pressure and sag
If I were setting one up from scratch, I would start in the middle of the sag range and move from there. Around 20-25% is a sensible starting point for a lot of trail riders, while 25-30% usually suits riders who care more about grip than front-end height. On wetter UK trails, that extra compliance can be worth more than a firmer feel, because roots and off-camber sections punish forks that are set too stiff.
Compression damping
The D1 version gives you both low-speed and high-speed compression control, which is where the fork earns its keep. Low-speed compression helps with brake dive, pumping, and body movement; high-speed compression helps the fork stay composed on sharper hits. My rule is simple: use compression to shape behaviour, not to cover up a bad air-pressure choice. If the fork feels harsh and skates across small bumps, backing off compression may help, but if the spring rate is wrong you will still feel it everywhere.
Read Also: Single Fork Mountain Bikes - Still Worth It?
Rebound and volume spacers
Rebound is the adjustment most riders underestimate. Too fast and the fork feels twitchy, especially on repeated impacts or when you are landing into rough trail; too slow and it packs down, rides low, and loses traction. Volume spacers are the final step, not the first one. I would only add them once sag, pressure, and rebound are close, because spacers are for end-stroke control and bottom-out resistance, not for fixing a fork that sits in the wrong part of its travel.
Where it feels at home on UK trails
This is the part that matters most if you ride in the UK rather than on endless dry trail. The Diamond 36 D1 SL makes sense when your routes include wet roots, steep descents, repeated braking bumps, rocky lines, and a fair amount of front-wheel loading in corners. In that kind of riding, a supportive chassis with proper compression control is more useful than chasing the softest possible initial stroke.
I would not put it on a pure XC race bike unless the rider really wants the stiffness and tuning range. It is simply more fork than many lightweight builds need, and you will feel that in weight and in the fact that it rewards a proper setup. Where it shines is on aggressive trail bikes, shorter-travel enduro rigs, and e-bikes that need a front end that does not fold under load. If your local riding is wet, technical, and unpredictable, the fork’s balance of grip and support makes far more sense than a firmer, simpler chassis.
How it compares with the other Diamond builds
The easiest way to place the Diamond 36 D1 SL is to compare it with DVO’s other current Diamond options. That is where the feature set becomes clearer, because the fork sits between a simpler, travel-focused model and the OEM-only spec tier.
| Model | What it gives you | Best for | Trade-off |
|---|---|---|---|
| Diamond 36 D1 SL | High- and low-speed compression, rebound, volume spacers, 140-160 mm travel, 36 mm chassis | Riders who want the strongest tuning range in the retail Diamond lineup | Not the lightest option in the range |
| Diamond 36 CORE | Full-range low-speed compression, rebound, volume spacers, 140-170 mm travel, 36 mm chassis | Riders who want more travel and a slightly simpler compression package | Less compression control detail than the D1 SL |
| Diamond D3 | OEM-only build with a simpler tuning approach | Stock-bike spec and riders who prefer a more set-and-forget fork | Not the best match if you want the most adjustment on the front end |
My practical read is straightforward: choose the D1 SL if you want to tune the fork properly, choose the CORE if your priority is more travel and a simpler control package, and look at the OEM-only D3 only if you are buying a complete bike or replacing what came on the frame. That comparison also makes the price positioning easier to understand, because the extra money is not just for branding; it buys you a more specific behaviour on trail.
A setup routine that saves a lot of guesswork
If I had to dial one of these in on a fresh build, I would follow the same routine every time. It is boring, but boring is often what gives you a fork that feels properly sorted instead of merely acceptable.
- Set sag first, not rebound or compression.
- Ride a familiar loop and check whether the fork is sitting too high or too deep in its travel.
- Open compression fully at the start, then add support only when you can clearly feel a need for it.
- Adjust rebound until the fork returns quickly enough to recover on repeated hits, but not so quickly that the front wheel feels nervous.
- Add volume spacers only if you are using travel too easily after the air pressure and sag are already correct.
For UK riding, I would bias the setup slightly more toward grip than brute support unless the bike is used for fast bike-park laps. On wet roots and loose clay, too much compression is usually the fastest way to lose front-wheel confidence. If the bike is electric, DVO notes that some riders may need 5-10 psi more than the base setting, which is a useful reminder that bike weight changes the whole conversation.
What ownership looks like after the first ride
Good forks rarely fail because of one big mistake; they usually get worse through neglect. DVO’s Diamond service guidance is fairly clear about that, and I think it is worth taking seriously if you ride through winter conditions or stack up lots of weekend mileage.
| Maintenance task | Interval | Why it matters |
|---|---|---|
| Clean stanchion tubes and inspect for scratches | Every ride | Keeps contamination from damaging seals and helps you catch wear early |
| Check air pressure | Every ride | Prevents the fork feeling inconsistent from one ride to the next |
| Check torque settings | 25 hours | Stops small hardware issues from becoming bigger ones |
| Remove lowers, clean and inspect bushings, change oil | 50 hours | Restores smoothness and keeps friction under control |
| Service air spring assembly | 100 hours | Protects consistency and air-spring performance |
| Service damper cartridge | 100 hours | Preserves damping quality and trail feel |
For UK buyers, there is one more real-world detail that matters: DVO ships from Los Angeles, so if you order direct you should budget for VAT, duty, and courier handling on top of the fork price. That can make a sale price look better or worse than it first appears, depending on where you buy. I would also be cautious about buying a used fork without a clear service history, because a neglected damper can make even a strong chassis feel dull and vague.
Where I would place it in a trail bike build
If I were building a UK trail bike for steep, technical riding, I would put the Diamond 36 D1 SL near the top of my shortlist. The reason is simple: it gives me enough chassis stiffness and enough damping control to keep the front end calm without pushing the bike into downhill territory. That combination is useful on rough descents, on hard braking into awkward corners, and on long rides where the fork still has to feel manageable after two hours, not just impressive in the car park.
I would not choose it for a light XC build, and I would not buy it if I wanted a fork that needs almost no attention. But if you ride hard, want tuneability you can actually feel, and prefer a fork that can be adapted to British conditions instead of just surviving them, this is a serious option. The safest way to think about it is this: buy it for control, not for minimal weight. If that matches your bike and your trails, it makes a lot of sense.
