Building Your Own Rocker Plate
A rocker plate decouples your smart trainer from the rigid floor and enables dynamic movement on the bike. It relieves the core, reduces saddle discomfort in practice, and makes the out-of-the-saddle effort biomechanically far more natural.
⏱ 1.5–2 h
Build time (Benjamin Martin's build report)
🛠 Hobbyist level
Jigsaw, drill, countersink
📐 3 templates
Universal · T8000 · XL for smart bikes
Material costs vary — for an honest, dated breakdown see the build report by Benjamin Martin (German PDF).
What to expect — an honest framing
Indoor cycling on a rigid trainer produces well-documented issues in the sit-bone area (perineum). Periodically standing out of the saddle and small in-saddle motion demonstrably relieve pressure. Bike lean is also mechanically meaningful in the sprint — a trainer that fully suppresses lean costs around 5 % peak power.
How much of that a rocker plate brings back is mechanistically plausible, but it has not been measured in a controlled study against a rigid trainer. In our years of testing since 2017, riders consistently report longer seat tolerance, less numbness and a more natural out-of-the-saddle feel — that is the practical basis of this page.
What is a Rocker Plate?
Differences to SprintBoard & Co., functional principles, and the biomechanical benefits for your indoor training.
Pre-Build Considerations
Size, damping, and axes of movement. Why small plates and rubber balls are the best choice.
Everything You Need: Step by Step
Tip before building: Before you start, it's worth checking eBay Classifieds or other second-hand platforms. You'll regularly find used rocker plates built exactly according to this guide. You can spot them by the three screws on the center axis — two sit closer together rather than being evenly spaced. Compare with our template.
The full build guide
DIY Build Guide. Concrete steps, dimensions, drill holes, and years of experience for your own build. How to build the plate in a few hours.
To the tutorial →Downloads
The shopping list
- Wood: Plywood or phenolic-resin panel, BFU100-bonded. Base and top plate 18 mm each. Phenolic-resin panels have a clear advantage: a factory-applied phenolic film — waterproof and sweat-resistant out of the box. No MDF, no OSB — full reasoning in the build guide's material section.
- Bearings (standard): 3× vibration isolators C 50×50 M10×10 (cylindrical, Shore 55, natural rubber).
- Alternative for more travel: 3× CT 50×50 M10 NR 56 (conical) — same footprint, noticeably more dynamic ride feel.
- Damping: 2× inflatable rubber balls 15–18 cm (best to order 3 as a spare).
- Fasteners: 6× countersunk screws M10 × 40 mm, hook-and-loop straps.
- For the front wheel riser: Scrap wood (2× 18 mm boards, 1× 50 mm wooden block) for approx. 8.6 cm height compensation.
For the build
- Jigsaw or circular saw (or hardware store cut)
- Cordless drill with 10 mm wood bit (for the M10 isolators)
- Countersink bit for M10 countersunk screws (crucial!)
- Sandpaper (120–180 grit) or orbital sander — to ease all edges and smooth the surfaces
- Folding rule, square & pencil
The Right Ball Pressure
The ball pressure is highly individual. The widespread myth that the setup depends on rider weight is false. The only deciding factor is your core stability, which correlates strongly with your annual cycling mileage. The more hours you spend in the saddle, the less counter-pressure you need from the plate.
Important: More pressure = less training effect + risk of bursting the balls.
There is no scientific formula for exactly which ball pressure creates which ride feel. The following values are based on years of our own testing and community feedback.
→ LIVE TOOL
The Ball Pressure Calculator.
Ball pressure does not depend on your weight, but on your trunk stability — and that correlates strongly with your saddle time. Set the slider to your approximate annual kilometres.
MANDATORY
Use a ball pressure gauge. Floor pumps are too inaccurate for 0.1 bar.
ANNUAL KILOMETRES / SADDLE TIME
8,000km
RECOMMENDED BALL PRESSURE
0.17 bar
≈ 0.15 – 0.19 bar · average over 3 measurements
RIDE FEEL
Dynamic &
flowing
Your stabilising muscles are well trained. The perfect compromise between stability and realistic lateral movement during hard out-of-the-saddle efforts.
FAQ
Before you start
How long does the build take?
About 1.5 to 2 hours — if the wood is cut at the hardware store.
This figure comes from Benjamin Martin's build report from Hamm, who finished the plate in 1.5 h with semi-pro tools and 2 h with consumer tools — including workshop cleanup. If you don't have your own saw: get the cut done at the hardware store, then 2 h is realistic even without prior experience.
Am I handy enough to build this?
A solid hobbyist level is enough — no pro workshop needed. Get the wood cut at the hardware store; that solves the hardest part. What really matters: precise drilling and clean countersinking so the trainer sits flat. A cordless drill, a 10 mm wood bit and a countersink bit are all you need.
Will it fit my trainer?
Three templates cover almost every setup:
- Universal (80×65 cm) — all direct-drive smart trainers like Wahoo Kickr, Tacx Neo, Elite Direto, Saris H3 and similar.
- T8000 — specifically for the Tacx Neo Bike T8000 with adjusted footprint.
- XL — for the large smart bikes Wahoo Kickr Bike, Kickr Shift and Zwift Ride as a continuous platform.
What are the most common build mistakes?
- Countersunk screws not seated flush — the trainer rocks on the protruding heads.
- Wrong rubber-isolator hardness — too hard makes the setup stiff. Standard is Shore A 55 (NR).
- Balls inflated without a precise gauge — bicycle pumps are far too inaccurate at 0.1 bar.
- Front-wheel riser forgotten — the rear sits 8.6 cm higher; the setup tips forward without compensation.
How safe is the setup in a hard sprint?
With a clean build and correctly set ball pressure: rock solid — even at sprint wattages well above 1000 W. Mandatory: hook-and-loop or strap fixation of the trainer. Recommended: re-tighten all screws after the first 5 training hours.
Do I really need a ball pressure gauge?
Yes. Floor pumps are far too inaccurate around 0.1 bar. For rocker-plate ball pressure, even a 0.02 bar shift changes the ride feel noticeably. Wrong pressure also means: too low (bottom-out) or too high (balls burst). A precise gauge (0–1 bar, 0.01-bar resolution) costs €20-30 and is mandatory equipment.
Can I build this without my own workshop?
Yes. The hardware store will cut the wood for you. Drilling and countersinking can happen on a balcony or in the yard. Total build time: about 2 hours. Tools: cordless drill, 10 mm wood bit, countersink bit, folding rule.
And the cost?
No fixed euro number on purpose: wood prices and shipping costs change regularly. For an honest, dated cost breakdown, see Benjamin's build report — he listed his parts. This way the page avoids stale price claims.
„Just from how it rides — 100% yes. Recommended without reservation."