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Permobil C350 question, need more speed

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    #16
    Easy enough with an adaptor, my motor flanges were 5 bolt, alloy wheels 4 bolt. Adaptor also spaced wheels out as they were wider than original. 120/70 x 8 tubeless tyres were slightly bigger diameter. More comfortable over rough ground than original.
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      #17
      Very nice execution!
      I wasn't expecting to see any wheel mounting circle to be small enough to fit inside of the other.
      How much bigger is the tire OD from the original?
      69yo male T12 complete since 1995
      NW NJ

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        #18
        I hit lucky with the alloys from China having that big pcd. 120/70 is about 10mm bigger diameter I think, 110/80 bigger again and 3.5 by 8 bigger still(15 inch v's 3 x 8 14 inch) . You have to consider that it raises the rear so you need a little more seat tilt.

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          #19
          Originally posted by mrb View Post
          Easy enough with an adaptor, my motor flanges were 5 bolt, alloy wheels 4 bolt. Adaptor also spaced wheels out as they were wider than original. 120/70 x 8 tubeless tyres were slightly bigger diameter. More comfortable over rough ground than original.
          Would they be usable on sand?

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            #20
            Originally posted by Gearhead View Post
            Recently acquired C350 that I will be converting for street use (cane holders, lights, flag, etc.). 5 MPH speed not fast enough for me. Want 8 or more MPH.
            Question: Will reprogramming speed it up or will I need different motors and controller then programed?
            Before I talk to a tech, I need as much info as possible because I usually have to "hold their hand".

            My C500 will do 10 MPH so I can handle the speed, although it can cause a "pucker" moment at times. I just want the stability of a rear drive C350 at speed.
            10mph really?
            Video of this?

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              #21
              Originally posted by landrover View Post
              Would they be usable on sand?
              Probably not those tyres but other 120/70 x 8 or 110/80 x 8 might be. If you go wider you will need new wheels. If you do it try and go tubeless

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                #22
                Originally posted by automation View Post

                I'll take some photos, Monday, as I've got the wheels off a Permobil chair, currently
                I looked at a few different chairs, today, and can't see any practical (i.e., "on the cheap") way that you can get a 50% (starting from the 6.5MPH "high speed upgrade" configuration) to 100% (starting from the 5MPH "base" configuration) increase in wheel diameter (to get to 10MPH) without seriously modifying the chair.

                The wheels can't continue to exist in their current "planes" as they will interfere with tie-downs, anti-tips and even the seating plate (unless you're configured for a really narrow seat!). And, any increase in diameter comes with a corresponding increase in seat height. (this may be desireable if operating outdoors as it gives you enhanced ground/obstacle clearance).

                You might be able to shim the motor mounts outward (probably more robust than trying to move the wheel out). And, if you could fabricate a (simple/flat) "shim" to do this for the motor, you could potentially rotate the motor upward so that the output shaft of the gearbox is raised to counteract the effect of the increased wheel diameter -- make it resemble a manual chair's proportions.

                [Actually, this might be an easy "kit" option -- if suitable tires could be found!]

                To the OP: Yeah, you're SoL. Looks like 5 (or 6.5) MPH is all you're going to get... (I think there are some Quickies that will offer you 8.5MPH)

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                  #23
                  Originally posted by pfcs49 View Post
                  Possible to increase tire diameter?
                  Considered tire diameter but don't want to lower torque.
                  Attack life, it's going to kill you anyway
                  Steve Mcqueen (Mr Cool)

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                    #24
                    Originally posted by automation View Post
                    Oooooo! Clever man! Speed indicated on the display would, of course, be wrong -- but you could make mental adjustments for that. Ditto for distance traveled (note to self: how does chair know how fast wheels are actually moving??)

                    Practical problem would be finding wheels that had the same bolt-hole positions...
                    A thick tread recap on my existing tires would increase diameter and retain same/stock wheels and chair width. Bonus: I could see black marks from doing burnouts (I wish). Of course higher speed needs different wheels for wider chair width too = stability.
                    I'm overdue for motor failure on my C500. Torque seems weaker. Need to disassemble motors for inspection and new brushes
                    Attack life, it's going to kill you anyway
                    Steve Mcqueen (Mr Cool)

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                      #25
                      Maybe this summer I'll put a bicycle speedo on it. Old Pilot+ has no screen. May borrow a Gopro.
                      Attack life, it's going to kill you anyway
                      Steve Mcqueen (Mr Cool)

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