Firewire, 2026

Firewire Boss Up 2026

1981mm long · 6'6"

511mm wide

73mm thick

39.5litres

See similar boards

Open in Studio See it on firewiresurfboards.com

Sizes & Numbers

Listed by the brand, read off a photo, or worked out

In one line

The 2025 outline, refined. The 39.5 L is the same length and width as the 2025 39.5 L.

39.5 L against the 2025 39.5 L, listed length and width.

As listed by Firewire

Firewire Boss Up 2026: every size as listed by Firewire
size	length	width	thickness	weight	price
39.5 L	6'6" · 1981 mm	511 mm	73 mm	–	US$995
40.8 L	6'8" · 2032 mm	514 mm	73 mm	–	US$995
43 L	6'10" · 2083 mm	518 mm	75 mm	–	US$1,125
44.3 L	7'0" · 2134 mm	519 mm	75 mm	–	US$1,125
46.4 L	7'2" · 2184 mm	521 mm	76 mm	–	US$1,125
48.4 L	7'4" · 2235 mm	519 mm	78 mm	–	US$1,125
51.1 L	7'6" · 2286 mm	524 mm	79 mm	–	US$1,125

Prices as the Firewire store showed them on 2026-10-27, in its currency · the cheapest version first, every version on hover

Every size side by side, tails on one line, one scale

Which Boss Up Size for Your Weight?

The Firewire Boss Up 2026 size each rider would pick, by weight and level

Your weight

kg≈ 165 lb

Your level

75 kg · getting there · look for 33.8–41.3 L

The Boss Up 39.5 L

2 sizes fall in your range; the 39.5 L is nearest its middle.

Other boards for you

A rule of thumb (0.45 to 0.55 L per kg you weigh), not Firewire’s chart

Every weight and level

Firewire Boss Up 2026: the size for a rider of 60 to 105 kg, by level
level	60 kg	75 kg	90 kg	105 kg
First sessions0.6 to 0.9 L per kg you weigh	44.3 L	51.1 L	51.1 L · small	too small
Getting there0.45 to 0.55 L per kg you weigh	too big	39.5 L	44.3 L	51.1 L
Confident0.38 to 0.45 L per kg you weigh	too big	too big	39.5 L	43 L
Expert0.33 to 0.38 L per kg you weigh	too big	too big	too big	39.5 L

Rules of thumb, not Firewire’s chart · “small” and “big”: the nearest size, just outside the range · How the sizes are worked out · Find your board

Next to your board?

Lay the Firewire Boss Up 39.5 L over up to four others, at one scale.

Compare with…

Generations

Before it · 2025

The 2026 39.5 L is the same length and width as the 2025 39.5 L. Open the 2025

listed length and width

2026 39.5 L 2025 39.5 L

The Firewire Boss Up over time

Shape & Rocker

From above, then from the side, true scale · the chosen size solid, the others dashed

Read off the 39.5 L outline · derived

52 %wide point, 1023 mm from the tail

3.87length over width

373mm wide 12″ from the tail

7,968cm² of planform

Read off the 40.8 L outline · derived

51 %wide point, 1043 mm from the tail

3.96length over width

370mm wide 12″ from the tail

8,155cm² of planform

Read off the 43 L outline · derived

52 %wide point, 1076 mm from the tail

4.02length over width

369mm wide 12″ from the tail

8,462cm² of planform

Read off the 44.3 L outline · derived

52 %wide point, 1102 mm from the tail

4.11length over width

366mm wide 12″ from the tail

8,695cm² of planform

Read off the 46.4 L outline · derived

52 %wide point, 1128 mm from the tail

4.20length over width

363mm wide 12″ from the tail

8,930cm² of planform

Read off the 48.4 L outline · derived

52 %wide point, 1155 mm from the tail

4.31length over width

358mm wide 12″ from the tail

9,109cm² of planform

Read off the 51.1 L outline · derived

52 %wide point, 1181 mm from the tail

4.36length over width

358mm wide 12″ from the tail

9,402cm² of planform

Rocker of the 39.5 L · measured

66 mmtail rocker, at the tip

28 mm12″ from the tail

39 mm12″ from the nose

114 mmnose rocker, at the tip

422 mmflat to within 3 mm, from 39 % to 61 % of the length

48 %of the length to the lowest point, from the tail

73 mmat its thickest, 48 % from the tail

21 mmlonger along the bottom curve than flat

Lay this rocker over other boards

Rocker of the 40.8 L · scaled from the 39.5 L measured

68 mmtail rocker, at the tip

30 mm12″ from the tail

41 mm12″ from the nose

117 mmnose rocker, at the tip

427 mmflat to within 3 mm, from 40 % to 61 % of the length

48 %of the length to the lowest point, from the tail

73 mmat its thickest, 48 % from the tail

21 mmlonger along the bottom curve than flat

Lay this rocker over other boards

Rocker of the 43 L · scaled from the 39.5 L measured

70 mmtail rocker, at the tip

31 mm12″ from the tail

43 mm12″ from the nose

120 mmnose rocker, at the tip

432 mmflat to within 3 mm, from 40 % to 60 % of the length

48 %of the length to the lowest point, from the tail

74 mmat its thickest, 48 % from the tail

22 mmlonger along the bottom curve than flat

Lay this rocker over other boards

Rocker of the 44.3 L · scaled from the 39.5 L measured

71 mmtail rocker, at the tip

33 mm12″ from the tail

45 mm12″ from the nose

123 mmnose rocker, at the tip

438 mmflat to within 3 mm, from 40 % to 60 % of the length

48 %of the length to the lowest point, from the tail

74 mmat its thickest, 48 % from the tail

22 mmlonger along the bottom curve than flat

Lay this rocker over other boards

Rocker of the 46.4 L · scaled from the 39.5 L measured

73 mmtail rocker, at the tip

34 mm12″ from the tail

47 mm12″ from the nose

127 mmnose rocker, at the tip

443 mmflat to within 3 mm, from 40 % to 60 % of the length

48 %of the length to the lowest point, from the tail

76 mmat its thickest, 48 % from the tail

23 mmlonger along the bottom curve than flat

Lay this rocker over other boards

Rocker of the 48.4 L · scaled from the 39.5 L measured

75 mmtail rocker, at the tip

35 mm12″ from the tail

50 mm12″ from the nose

130 mmnose rocker, at the tip

448 mmflat to within 3 mm, from 40 % to 60 % of the length

48 %of the length to the lowest point, from the tail

78 mmat its thickest, 48 % from the tail

23 mmlonger along the bottom curve than flat

Lay this rocker over other boards

Rocker of the 51.1 L · scaled from the 39.5 L measured

77 mmtail rocker, at the tip

37 mm12″ from the tail

52 mm12″ from the nose

133 mmnose rocker, at the tip

453 mmflat to within 3 mm, from 40 % to 60 % of the length

48 %of the length to the lowest point, from the tail

79 mmat its thickest, 48 % from the tail

24 mmlonger along the bottom curve than flat

Lay this rocker over other boards

True proportions · dots at 10 mm and 12″ in from each tip · bracket: flat to within 3 mm · Measured on Firewire's photo of the 39.5 L. Tail end set by Firewire's photo convention, not checked by a person.