As with most things kite there is no black and white answer. I could write 12 paragraphs on board sizes here but in the end it comes down to what you want.

Here are a few factors that will affect you choice of size though-

-Riding style
-How powered do you ride
-Conditions you ride
-Speed of board
- Rocker
- Tip width
- Type of kite

Try a few out.

Mate i weigh the same as you and i have used a fair few of my mate's boards over the years - i ride heavily powered up usually on an 11m kite up to 25 knots, i'm into freeriding with big boosts and oldschool stuff mainly. I can tell you from experience that using a smaller than 130cm length board is better for me, as is using larger fins than usual and with a narrower board. The width of the board tends to be the most important factor for me, I need it to be narrow so that i can jam the rail down hard to edge and hold down lots of power. The larger fins also come into play there.

Currently i use a 126cm naish sol which i think is only 35 or 36cm wide, this has been just perfect so far. I still get out in 12 knots but i can use this board right up to 35 knots on a smaller kite.

hope that helps!

Found this on the net when i was looking hope it helps

Kite boards are available in three distinct styles although the market is dominated by bi-directional boards...

Twin Tip Boards

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Dimensions (length and width)...

The performance of a kite board is largely determined by the planing area (surface area) of the base (but also the shape: more later so read on...). Planing area is influenced predominantly by board length, but changing the board width also affects the overall ride and feel of a board.

Longer boards with more planing area are better suited to beginners and lighter winds. The use of a larger board with increased buoyancy allows a beginner / intermediate rider to use a smaller kite for improved safety and confidence. Shorter boards with less planing area offer a more comfortable ride in powered conditions, making them more suitable for advanced riders and higher wind conditions.

The planing area of a board can also be increased by increasing the width of board, allowing rider to use a shorter board that offers good powered performance, yet still retain good light wind performance. Note that boards with increased width are less suited to choppy conditions since they feel more buoyant and are more likely to bounce around over rough water.

Riders choosing a board need to consider the style of riding they wish to pursue and the type of conditions they are likely to ride in.

Board Shape...

Planing area is also influenced by board shape. A rectangular shape with wide tips will plane earlier and will offer improved 'pop' for freestyle riding. Boards with narrow tips (and a more diamond shape) offer enhanced control in powered conditions with smoother transitions from edge to edge during carve turns. Narrower boards excel in powered conditions since they give a smoother and faster ride through choppy water conditions.

Rocker...

Rocker describes the curvature of the base of the board from end to end - the best way to view a board's rocker line is by viewing the rail side on. Kiteboard performance is affected both by degree of rocker and the distribution of rocker along the board's length.

A board with a large degree of rocker will give a smoother ride since the nose is less likely to catch the water when riding the board flat after landing a jump or when turning. These characteristics enable much better performance in chop and give the board more grip and control in powered conditions. However, increasing the rocker demands more kite power to enable the board to plane, so the light wind ability of the board is compromised. Flatter boards with less rocker offer a faster ride in flat water (since they plane more easily) and improved 'pop' since there is more rail in the water to load and release.

Rocker is normally distributed in two way: continuous or in 3 stages. Boards with continuous rocker have a smooth curve along the entire length of the board, creating a smooth and fast ride. Boards with 3-stage rocker have a relatively flat surface overall to aid planing, but with increased rocker at both ends to give a smooth ride and prevent the tips diving when riding chop. 3-stage rocker creates a slower ride but with improved 'pop'.

Flex...

The flex of a board creates a smoother ride by absorbing energy as the board cuts through the water - this is not necessarily a desirable trait since flex can creates a soggy feeling with limited 'pop'. Increasing the flex also affects the performance by changing the rocker of the board during the application of pressure, when edging hard for example. Practically, this can facilitate early planing whilst offering increasing grip as more pressure (and hence rocker) is applied during edging. Flex clearly plays a crucial role in determining the board's characteristics. Stiff boards favour heavy riders, freestyle riders and powered conditions. A more flexible board will benefit lighter riders and less powered conditions.

Flex Tips...

A stiff board with flexible tips creates a dynamic ride that can respond accordingly to different riding environments. During powered conditions, the tips will flex as edge pressure is applied enabling the board to ride through chop well, whilst still maintaining a low degree of rocker over the main base of the board to facilitate 'pop'. In lower wind conditions, the board base remains flatter to facilitate planing.

Concave...

Kiteboards now feature many different base designs from channels, concave formations, combinations of the two, or simply a flat base. Concave describes the curvature of the base of the board from side to side - the best way to view a board's concave is by viewing the board end on.

Concave increases the stability of the board, making it easy to edge and thus promoting upwind performance. Although concave designs have more drag, the smoother ride can actually increase board speed since it is easier for the rider to maintain consistent edge control.

Double concave comes into play when riding the board flat rather than when edging. It helps prevent the rails from catching, so those powered blind landings that we all do suddenly become easier! The smooth edge to edge transitions also add fluidity to wave riding. A well designed double concave board base can provide the increased grip associated with a singe concave feature, whilst allowing a nice skatey ride when riding the board flat.

Channels on the board base are rare but simply act like fins, promoting grip and allowing the board to be edged harder.

Text and images Copyright © Session1

oops i didn't even see that

stage6 said...
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Thinking about the crazyfly Chatwell Pro - any reviews of that?

I have just bought the Chatwell Pro. Not many reviews out there but those that I've seen are v positive. Board looks the nuts and is very light. Full carbon - and I'm guessing going to be pretty stiff. Just need some wind!

I think it's just down to finding what you like - ideally try before you buy!

replying on boxburg's account

Neill: i love boards between 130 and 120cm. the shorter they are (within reason) the better you can hold down lots of kite power, the better you can throw the board around and change direction - the only problem is they tend to catch the whitewash and chop a bit more which can throw spray in your face and cause you to nosedive the board if you're not careful. personally a board over 130cm is a compromise for me at this weight, but each to their own. if your riding style is different to mine you will likely have a totally different preference.

cheers and good luck!

So what are you actually saying Charl De Villiers, it soundsto me like afrikaans. I'm confused, but I am a local idiot.
remember 1cm width= 5cm length.