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  1. #1
    Platinum Member
    Join Date
    Jul 2010
    kubota 4200

    Default 20" discs vs. 18" discs....advantages?

    Looking at a Keen Kutter disc here that has 20 inch discs on it. Most others of this type have the 18". Its a 6 1/2 foot disc and I think my 44 HP kubota won't have any issues pulling it. What are the benefits of the larger 20" discs and should I let it sway me over another disc I'm looking at thathas 18" inch discs.

  2. #2
    Platinum Member
    Join Date
    Jun 2010
    north Mississippi
    NH 3040

    Default Re: 20" discs vs. 18" discs....advantages?

    cut a little deeper if the disc is heavy enough.
    NH 3040 fel 6' cutter
    JD 737 zero turn
    polaris ranger xp
    99 honda 300
    Trek Emonda SL8.

  3. #3
    Elite Member
    MtnViewRanch's Avatar
    Join Date
    Mar 2005
    4000\' mountains of Southern California
    Mahindra 7520, Mahindra 3215HST, Case 580 extendahoe, Case 310 dozer, Parsons trencher, Cat D6,

    Default Re: 20" discs vs. 18" discs....advantages?

    The 20" disks are the way to go IMO. You would have the capability of digging 1" deeper, the disk will weigh more just because of the size and they might even be made of thicker material which would be adding more weight and strength. I would get the 20" disks if it were me.
    Top and Tilt Kits by Fit Rite Hydraulics

  4. #4
    Platinum Member
    Join Date
    Apr 2010

    Default Re: 20" discs vs. 18" discs....advantages?

    Bigger rolling radius also allows the disc to walk over objects easier.

    The biggest drawback of 20 over 18 is the cost.

  5. #5
    Super Member
    Join Date
    Apr 2000
    central New York
    all makes and models

    Default Re: 20" discs vs. 18" discs....advantages?

    For us in the north east an 18" blade is small and it would make the disc more prone to bearing and axle trouble do to the stones. The larger diameter blade will normally walk over obstacles better. You could say you would gain weight as well as life!

  6. #6
    Elite Member gwdixon's Avatar
    Join Date
    Jul 2009
    Northern CA

    Default Re: 20" discs vs. 18" discs....advantages?

    If you get into soft soil or sand the blades could sink far enough to drag the axle through the ground. It puts a tremendous strain on the tractor. Multiple passes will do the same in muddy or wet ground.

    Go with the larger blades. They will wear down soon enough anyway.
    2009 Kubota M7040, R1s, LA1153 FEL, fork lift, 3 rear remotes, T&T
    2002 Kubota L48 TLB, 12", 18", 24" HD buckets
    2001 Kubota BX2200, Turf, LA211 FEL
    7.5' Howse 3PT disc, 88" Gearmore 4G4 box scraper, 4' box scraper, Gearmore GB85 blade, LandPride RCR2596 cutter, 6', 4' flail mowers, 6', 4' rototiller, 4' Bush Hog cutter, HD subsoiler, Bearcat 70554 chipper, Bush Hog PHD w/ 12", 6" augers, Ford 101 3-bottom plow, 8' land leveler, 6' rake, lots of misc.

  7. #7
    Advertiser sweettractors's Avatar
    Join Date
    Jul 2003
    Central Kentucky
    JD 6403 CHA-JD 3130 CHA

    Default Re: 20" discs vs. 18" discs....advantages?

    The larger diameter disc blades are more aggressive, however, they leave a little rougher finish. A drag behind the disc should take care of that issue. Ken Sweet

    Sweet Farm Equipment LLC (Internet Sales, Shipping All States)
    Shipping Facility
    1815 Defries Rd., Canmer, Ky 42722 Toll Free 1-866-528-3323
    Ken Sweet

    Shipping Example: Can ship 800 lbs from Ky. to Dallas for $165
    The Northeast shipping corridor is a little more expensive.

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