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MR4139 INLINE Pinion (The best 1.5mm pinion ever)

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  • MR4139 INLINE Pinion (The best 1.5mm pinion ever)

    I just got 5 of of the Mr slot car 1.5mm pinions and wanted to thank you for making these.

    It sounds silly to do a review of such a small item and it will probably go unnoticed but I felt like telling people about them.

    I picked up five of these MR4139 )INLINE Pinion STEEL 9 Tooth 5.5mm Dia. for 1.5mm Shaft) for a project of cars that I am replacing the motors on.

    I am trying to tame the Scalextric Volkswagen bus. These come with 20k rpm FF motors and are just wildly over powered. I replaced the motors with M/T-SL1 motors. I needed a 9 tooth pinion and when searching for a replacement I cam across these.

    If you look at these pinions, you see they have a small extra shaft on them and this shaft fits perfectly in the the groove on an inline gear, creating virtually no slop in the mesh.

    This simple change is brilliant ! I hope this sets the new standard for 1.5mm pinions going forward.

    Such a small thing, but the results are so good ! I just felt like sharing it. In fact, I am now looking at buying one of your cars and seeing if there are any other small innovations that would not appear on the outside.
    Last edited by jeremycobert; 03-03-2015, 07:17 AM.

  • #2
    I'll second those comments!

    Just discovered them 2 weeks ago - Using them on a project I have going and they are perfect!

    Best 1.5mm pinion anywhere


    • #3
      thanks for posting this, its great to know I have a couple on inline cars I would like to do the same to...
      cheers again


      • #4
        I have use a few of them, but did find that the 10t ones I used required a fair bit of running in to get. Smooth mesh with Slot It gears. Probably best to use them with MR crown gears.


        • #5
          Jeremy: Buy yourself a McLaren. This is the best thought out slot car I have ever seen. Ernie has built in all of the things we normally have to do to get a car competitive, and you can take it out of the box and put it on the track and go.

          We recently finished the Canada Proxy. There were 26 of these cars racing across the country. In most races the cars were all within one lap total. Mine is the fastest car I own and that includes several NSRs, Slot.its, and a lot of scratchbuilts.

          I like that little collar idea on those pinions, as it saves having to shim the axle for a good mesh.


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