General Measurements for Saddle Trees
Here are some general measurements that *most* saddles will fit into. Keep in mind that the brand of saddle, and the type/make of tree varies from brand to brand, and even year to year. This is just like how car bodies and styles will vary from year to year within the same make. When a saddle company decides to change the trees they are building on, for whatever the reason, the new tree maker has his/her own idea of what a semi, full and wide tree measurement should be. So, while a particular model may still be labeled QH tree…it could potentially be up to 3/4" wider or narrower than the same brand and make of saddle you might have purchased 1 year earlier!!
From one Saddlery to another, tree specifications can vary as much as 1-inch difference (Circle Y, Herford, Crates, Martin, Billy Cook etc.) …which is why I am giving you a range on each tree size.
THE IMPORTANT THING TO REMEMBER IS THAT ALL COMPANIES DEFINE THESE MEASUREMENTS DIFFERENTLY, AND THERE IS NO INDUSTRY STANDARD.
Here are some GENERAL rule measurements to assist you in deciding what tree your saddle has in it:
Pony tree usually measures 5-6"
Semi QH tree is usually 6.5 to 6.75"
Full QH tree is typically 6.75 to 7"
Wide tree are usually 7 to 8"
Draft trees are usually 7.5 to 8", and have greater than 90 degree angle to the bars over the gullet
My best advice is to take your horse in for a saddle fitting with the saddle of your choice to be certain its a good fit for your horse.