You hangboard twice a week. Your numbers have gone up for two cycles straight. Then you get back on your project and the crimps feel exactly the same as they did in October.
If the edge can roll, your FDP has to stay honest.
Part of what's going on: a fixed wood edge doesn't only train your finger flexors. It trains skin adhesion, friction management, and whatever grip compensations your hand has quietly built up over the years. The load is real, but it's shared across tissues and strategies you didn't mean to recruit. The Dual Edge RXE was built to take those variables out of the equation and leave the FDP mostly isolated.
What It Is
A rolling edge training platform. Ball-bearing rollers replace the fixed edge of a hangboard, and a light texture on each roller signals grip stimulus without letting skin hang on. You're not gripping an edge. You're closing your fingers against a surface that will roll out from under you if your FDP checks out.
Two variants:
28RXE. Full-pad comfortable edge, swappable rollers, the default starting point. If you've done structured hangboard work before and want to add an FDP-biased session to your week, this is the one.
22RXE Micro Elite. Much smaller edge, higher stimulus, and the effective feel is closer to a 5–10mm hold than its measured depth suggests. This is not a beginner tool. We only recommend it to climbers with a long training history who are already comfortable on holds around 10mm.
Worth naming upfront: this is not a hangboard replacement. It's a complementary tool for climbers who already train fingers and want a cleaner FDP stimulus than a fixed edge can give them.
Why Rolling Changes the Stimulus
Stable geometry
Unstable under load
Friction is a variable, not a constant. On a wood edge, how secure your grip feels depends on skin condition, chalk, humidity, the depth of the edge, and how your pads happen to sit on it that day. Some of that is training. A lot of it is noise.
Take the friction out and the finger flexors do the work alone. The mechanics force you into a talon grip position, DIPs engaged on the roller, middle phalanx at 90 degrees to the back plate, which biases load toward the FDP in a way a fixed edge doesn't reliably produce. You can chase the same position on a hangboard, but nothing on the board is stopping you from cheating it. The roller is.
This isn't cosmetic. sEMG research on climbers during maximal dead-hangs (Devrnja & Matković, 2023, PeerJ) found that different grip positions recruit the FDP and FDS at meaningfully different rates, even at similar loads. Position is a recruitment decision, not a style preference. And the reason that recruitment decision matters at all traces back to Schweizer & Hudek (2011), whose work established that finger flexor force per unit bodyweight is the strongest single predictor of climbing grade. If FDP force is the thing that moves the needle, then a tool that isolates FDP loading more cleanly than a fixed edge isn't a gimmick, it's a more direct path to the stimulus you were already chasing.
The failure mode is the other half of the story. On a hangboard rep that goes to failure, you peel off slowly as skin gives up. On a roller, failure is the finger rolling off. That's why 1RM work is off the table here, and it's worth being honest about that rather than dressing it up as a feature. You cannot safely hunt max loads on a tool where the failure is uncontrollable. That's a real limitation. It's also the reason the protocol below looks the way it does.
How to Actually Program It
- Setupclaw / open through the roll
- Workshort hard holds
- Restfull recovery
- Stopform collapse or sharp pain
Think of this as a small, high-quality finger session you plug into your existing week alongside your other dedicated finger training. Not something you do daily, and not something you invent on the fly.
A baseline that works for most people:
- 40–45 second timed holds
- Load kept well below your hangboard 1RM, this is sub-maximal by design
- 5–6 holds per session, 2–3 minutes rest between
- 2x per week, on days you already train fingers
Form is the whole game. DIPs engaged on the roller surface. Middle phalanx square to the back plate. Talon position. Do not hyperextend to get behind the roller, that's the most common error, and it moves load off the FDP and into places you didn't want it.
Avoid 1RM attempts. Avoid daily use. If you're feeling a tweak, the answer is the same as on any other finger tool: stop, deload, come back when it's gone.
Fingertip pressure on the 22RXE during power sessions is expected. The intensity is part of the stimulus, and with sensible progression, skin and tissue adapt. If something hurts in a way that isn't intense-but-fine, that's a signal, not a challenge.
Who It's For and Who It Isn't
For: climbers with an existing hangboard base who've plateaued on finger-intensive projects, or who want a cleaner FDP stimulus without the skin tax that comes with heavy repeater work.
Not for: newer climbers still building baseline tendon resilience. People looking for a single-tool solution. Anyone expecting a max-strength 1RM protocol out of this.
If this is your first finger training tool, it isn't the one. Buy a hangboard, do structured work on it for a year, then come back. The RXE is for people who have already earned the right to be bored of their hangboard.
Start Here
If you're new to rolling edges, get the 28RXE and run the protocol above for a full training block before you change anything. Earn the 22RXE by being comfortable on 10mm holds for real, not aspirationally.
Shop the Dual Edge RXE collection →
References
- Devrnja, A., & Matković, B. R. (2023). Exploring forearm muscle coordination and training applications of various grip positions during maximal isometric finger dead-hangs in rock climbers. PeerJ, 11, e15464. https://pmc.ncbi.nlm.nih.gov/articles/PMC10249616/
- Schweizer, A., & Hudek, R. (2011). Kinetics of crimp and slope grip in rock climbing. Journal of Applied Biomechanics, 27(2), 116–121. https://doi.org/10.1123/jab.27.2.116