Slab Rat
Step-up · Shapes by Kirk Bierke, UlladullaPublished model
A short step-up for late entries, slab waves and heavy barrels.
- Type
- Step-up
- Lengths
- 5'11
- Fins
- thruster, quad
- Build
- Recommended medium-strong: 6oz + 4oz deck / 6oz bottom, Recommended strong: double 6oz deck / 6oz bottom
Design
- Pulled-in tail
- Single to double concave
- Rocker designed for late release
Available with a five-box option for switching layouts.
Sizes
| Length | Width | Thickness |
|---|---|---|
| 5'11 | 18 1/2 | 2 5/16 |
Source sizes & details
- Volume and full custom size range
- Current custom-order price
- Fin box system
More from Shapes by Kirk Bierke
Swipe for specifications · board names stay in view
| Shape | Board | Length | Volume | Fins | From |
|---|---|---|---|---|---|
| The BreezePublished model | 5'10 | twin, twin + stabiliser | On request | ||
| Big FishPublished model | 7'2 | quad, twin | On request | ||
| Rounded UpPublished model | 5'11 | thruster, quad | On request | ||
| Step UpPublished model | 6'4 | thruster, quad | On request | ||
| Mid LengthPublished model | 7'0 | thruster, quad | On request | ||
| Roll InPublished model | 7'0–10'6 | thruster, quad | On request | ||
| Open OceanPublished model | 10'0–10'7 | thruster, quad | On request | ||
| ChargePublished model | 7'0–10'6 | thruster, quad | On request | ||
| EdgePublished model | 7'0–10'6 | thruster, quad | On request | ||
| SurgeonPublished model | 6'0 | thruster | On request |
Details from kbsurf.com, 4 Nov 2026. Catalogue status is not live stock confirmation. Check specs, prices and ordering with the shaper.