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SURFBOARDS > BLACK THUMB

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Roberts Surfboards Black Thumb
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BLACK THUMB

$695.00
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​DESCRIPTION

Derived from the Black Diamond with the same nose outline and the addition of a pulled-in round thumb tail.  This board has single to double concave with an accelerated tail rocker. It excels in the upper reaches for wave size of a shortboard but you ride it 2 inches shorter, a half inch wider and in the same thickness.  The shorter rail line allows for tighter arcing turns in the pocket.

​Designed for bigger surf, the Black Thumb is good wave board that paddles easy and can handle high speed turns.

FEATURES

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ROCKER

Low entry rocker with accelerated tail rocker in the last 18 inches of the board.

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RAILS

Medium Full Rails with tucked hard edges to handle high speed turns.
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BOTTOM

Deep single to a double out the tail. Fast and stable in high speed turns..
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FINS

Tri fin is standard.  Also works well as a quad.  Five fin convertible is a great option.
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WAVE TYPE

punchy from 2 to 8 feet
Roberts Surfboards Black Thumb Logo

SIZE GUIDE

Standard Sizes
Surfers weight 
according to ability
BLACK THUMB
Ltr
Adv
Inter
Novice
5’0 x 17 1/2 x 1 7/8
17.81
110
95
80
5’1 x 17 5/8 x 1 15/16
18.78
115
100
85
5’2 x 17 3/4 x 1 15/16
19.32
120
100
85
5’3 x 17 7/8 x 2
20.33
125
105
90
5’4 x 18 x 2
20.85
125
110
90
5’5 x 18 1/8 x 2
21.38
130
115
95
5’6 x 18 3/8 x 2 1/16
22.64
135
120
100
5’7 x 18 7/16 x 2 1/8
23.66
145
125
105
5’8 x 18 1/2 x 2 1/8
24.13
150
130
105
5’9 x 18 5/8 x 2 3/16
25.42
155
135
110
5’10 x 18 3/4 x 2 1/4
26.84
165
140
120
5’11 x 18 7/8 x 2 5/16
27.89
170
145
125
6’0 x 19 x 2 3/8
29.25
180
150
130
6’1 x 19 1/8 x 2 3/8
29.97
185
155
130
6’2 x 19 1/4 x 2 7/16
31.24
190
160
135
6’3 x 19 3/8 x 2 7/16
31.82
195
165
140
6’4 x 19 1/2 x 2 1/2
33.38​
205​
175​
145
6’5 x 19 3/4 x 2 9/16
35.04
215
185
155
6’6 x 20 x 2 5/8
36.78
225
195
160
6’7 x 20 1/4 x 2 11/16
39.07
240
205
170
6’8 x 20 1/2 x 2 13/16
42.36
260
220
185

how to size this board

Order this board 2" shorter, 3/8" wider and same thickness or 1/16 thinner than your high performance short board. ​Custom dims are always available to match your needs or preferences. Please feel free to use our BOARD SIZING QUESTIONNAIRE to receive more info about our boards and sizing.

SIMILAR MODELS

Black Diamond

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Roberts Surfboards
1362 Tower Sq. # 3 
Ventura, CA 93003
Factory Phone: 805.658.6855
Send us a message HERE
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  • SURFBOARDS
    • SURFBOARDS
    • VOLUME FINDER
    • BOARD SIZING QUESTIONNAIRE
    • LOGO / ART OPTIONS
  • TECHNOLOGY
  • ABOUT
    • ABOUT ROBERTS
    • TEAM
    • VIDEOS
  • INSTAGRAM
  • DEALERS
  • SHOP
    • SHOP CUSTOM SURFBOARDS
    • SHOP FINS
    • SHOP LEASHES / TRACTION
    • SHOP APPAREL