Where it fits
This model is classified as Alternative Performance Twin. Use the documented family, selected size and intended conditions to decide whether that direction matches the surfer's brief.
Alternative Performance Twin
Simon Anderson Alley Grom
Super high performance small board model for young surfers looking to go to the next level of surfing. Same as the big brother Alley...
Official manufacturer information
Typical surfer profile
Intermediate to Expert surfer seeking a alternative performance twin.
Wave direction
The available board information associates this model with reef break, open face, beach break. Confirm the intended wave range with the manufacturer.
Where it sits in the design range
The Alley Grom sits in the Alternative Performance Twin family with a Alternative Performance Twin direction. Related models may solve a different design job even when their volume is similar.
Dimensions and volume
Available size range
4'8 to 5'6, 14.15L to 21.13L across the reviewed board specifications. The table below shows the complete available size range.
| Length | Width | Thickness | Volume | Construction |
|---|---|---|---|---|
| 4'8 | 17 | 1 3/4 | 14.15L | PU |
| 4'9 | 17 1/8 | 1 13/16 | 15L | PU |
| 4'10 | 17 1/4 | 1 13/16 | 15.41L | PU |
| 4'11 | 17 1/2 | 1 7/8 | 16.38L | PU |
| 5'0 | 17 5/8 | 1 7/8 | 16.9L | PU |
| 5'1 | 17 5/8 | 1 15/16 | 17.8L | PU |
| 5'2 | 17 3/4 | 1 15/16 | 18.08L | PU |
| 5'3 | 17 7/8 | 2 | 19.09L | PU |
| 5'4 | 18 | 2 | 19.5L | PU |
| 5'5 | 18 1/8 | 2 1/16 | 20.6L | PU |
| 5'6 | 18 1/4 | 2 1/16 | 21.13L | PU |
Board design direction
- Public family
- Performance Shortboard
- Detailed category
- Alternative Performance Twin
- Ability guidance
- intermediate, advanced, expert
- Fin configuration
- Twin
- Wave intent
- reef break, open face, beach break, average, powerful
- Strengths
- sensitivity, speed generation, drive
- Trade-offs
- forgiveness, stability
Guidance describes board characteristics, not a guaranteed performance outcome.
Board DNA
A compact view of how this board is designed to behave. Live stock and sizing remain the main purpose of this page.
- Paddle
- 6 / 10
- Speed
- 8 / 10
- Drive
- 8 / 10
- Release
- 8 / 10
- Hold
- 7 / 10
- Forgiveness
- 5 / 10
- Sensitivity
- 9 / 10
- Outline
- narrow
- Rocker
- medium entry / medium high tail
- Rails
- refined
- Quiver role
- performance, reef alternative
Quivrr Board DNA is derived from current manufacturer design information and governed Quivrr classification.
Check current regional availability
Stock is not baked into this page. Choose a region to run a current Quivrr search.
Other boards in this family
Related design guidance
How to choose a surfboard, understand volume and sizing, or ask Bodhi to explain trade-offs.
Reviewed by QUIVRR editorial on 2026-07-14. Board information updated: 2026-08-19. Confirm final specifications with the manufacturer or retailer.