9cm shanks on a weymouth

I'd say so! I always thought that 5cm is standard, but 7cm is more severe but more common in dressage circles. I haven't heard of a 9cm before, but maybe it includes the part above the mouthpiece as well as the shank below.
 
Shank length is measured below the mouthpiece, so 9cm is longer than normal

However due to physics you have to move your rein further to get the same effect, so weirdly if you are a light handed rider, it may dull the aids and help a horse that is too sharp

Obviously on the heavy handed rider there is a mechnical advantage to a longer shank and the woah is more when you haul, but that isn't standard dressage riding
 
You'd have to try and see which works

You may find the shorter shank means you can do little half halts to stop him leaning, on the longer shank these are dulled, but then if not being irritated by the sharpness of the bit he may stop leaning!!

Also worth experimenting with the mouthpiece, as you can try tongue relief, or the opposite and go for a straighter bar to squish the tongue

Sadly its only your horse than can tell you what he likes!!
 
Thank you! I tried him in an NS warmblood weymouth (7cm) which he hated, and am now trying an Informed Designs weymouth but they sent out a 9cm shank one and i am unsure. I suppose the only way i could try both is to order another one at 7cm and see the difference. But they aren't cheap!!
 
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