Double blades for 21"


LawnSite Member
Laporte, Indiana
Going to start this spring, already have a 21" Craftsman wondering if I can double blade this as well as the rider I end getting? Thanks in advance!


LawnSite Senior Member
Alexandria, MN.
I think I would stay away from putting double blades on that machine. I just dont think that it would have enough HP to do what you want, and will put unnecessary stain on the engine. With a large machine, and more HP you are able to do that.

Eric ELM

Husband, Father, Friend, Angel
Chicago, IL USA
It depends on which rider you get. What are you going to get, a Dixie Chopper, Exmark, Toro, or equivalant? If so, you should have no problem. If your rider is the same brand as your 21", I wouldn't advise it.

I wouldn't try to use doubles on a 21" unless you get the mulching blade that looks sort of like double blades. Most 21" has a 2 bolt or cradle type mount.

Mike Paulsen

LawnSite Member
put doubles on my jd 21" last year. it cut the grass up a little more than the single. i had to set it up like a trac two razor. put spacers between the blades.


LawnSite Member
along time ago i tried the double set up on a 5hp 22. It would do a great job if the grass was short but if it were tall and the engine bogged down it took too long for it to pick back up. Too much time lost-the single works fine for a pusher.
I have used double blade system before, but it was under manufactures, spec. Honda's uses a double blade system when mulching.

In 25 years of mowing grass, I have never seen a double blade system other than the honda. The little 5hp 6hp engines can't handle the extra blade. Plus, on just most 21" commercial models, they only have a 1/4" clearance from the bottom(rim) to the blade.