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DT125R FORUM

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  4. 19” YZ wheel & Sprocket

19” YZ wheel & Sprocket

Scheduled Pinned Locked Moved Wheels
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  • Stevie WonderS Offline
    Stevie WonderS Offline
    Stevie Wonder
    wrote on last edited by
    #11

    @Calum it might be worth building an 18” rear to use then, fucking about with sprockets is a pain in the ass.

    Also my original tire size I was used to having when I was running my 18” rear was 120/100-18 or 140/80-18, I can’t remember exactly. All I remember was thinking bigger was better at the time of ordering them.

    If I was to get an 18” wheel again I’d run 100/100-18 or alternatively 120/80-18 if I couldn’t find the previous size

    CalumC 1 Reply Last reply
    0
    • Stevie WonderS Stevie Wonder

      @Calum it might be worth building an 18” rear to use then, fucking about with sprockets is a pain in the ass.

      Also my original tire size I was used to having when I was running my 18” rear was 120/100-18 or 140/80-18, I can’t remember exactly. All I remember was thinking bigger was better at the time of ordering them.

      If I was to get an 18” wheel again I’d run 100/100-18 or alternatively 120/80-18 if I couldn’t find the previous size

      CalumC Online
      CalumC Online
      Calum
      wrote on last edited by
      #12

      @Stevie-Wonder I seriously doubt that you will notice that much of a drop in performance/top end with 1 inch wheel size and a different rear sprocket. So long as it's close enough you'll be fine.

      Always Originate, Never Pirate!

      Stevie WonderS 1 Reply Last reply
      1
      • CalumC Calum

        @Stevie-Wonder I seriously doubt that you will notice that much of a drop in performance/top end with 1 inch wheel size and a different rear sprocket. So long as it's close enough you'll be fine.

        Stevie WonderS Offline
        Stevie WonderS Offline
        Stevie Wonder
        wrote on last edited by
        #13

        @Calum sprockets are still the same, also you’d honestly be surprised the difference it’s not a huge one but it’s enough to completely change the way I have the ride the bike.

        The gears as of a lot longer and are like a supersport 125, to get to the top end of your power band you really have to hold her WOT for quite a long time, because of this and the length of 4th and 5th you now can’t change into powerband to keep pulling in 6th.

        Off road has a couple of advantages and makes the bike a little nicer to cruise on but overall it’s really not doing me or the bike favours

        CalumC S 2 Replies Last reply
        0
        • Stevie WonderS Stevie Wonder

          @Calum sprockets are still the same, also you’d honestly be surprised the difference it’s not a huge one but it’s enough to completely change the way I have the ride the bike.

          The gears as of a lot longer and are like a supersport 125, to get to the top end of your power band you really have to hold her WOT for quite a long time, because of this and the length of 4th and 5th you now can’t change into powerband to keep pulling in 6th.

          Off road has a couple of advantages and makes the bike a little nicer to cruise on but overall it’s really not doing me or the bike favours

          CalumC Online
          CalumC Online
          Calum
          wrote on last edited by
          #14

          @Stevie-Wonder You do realise the wheels I'm running on my DTR right???

          Always Originate, Never Pirate!

          1 Reply Last reply
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          • Stevie WonderS Stevie Wonder

            @Calum sprockets are still the same, also you’d honestly be surprised the difference it’s not a huge one but it’s enough to completely change the way I have the ride the bike.

            The gears as of a lot longer and are like a supersport 125, to get to the top end of your power band you really have to hold her WOT for quite a long time, because of this and the length of 4th and 5th you now can’t change into powerband to keep pulling in 6th.

            Off road has a couple of advantages and makes the bike a little nicer to cruise on but overall it’s really not doing me or the bike favours

            S Offline
            S Offline
            SpookDog
            wrote on last edited by
            #15

            @Stevie-Wonder

            Seriously bud?! Building another wheel is less hassle than changing a front sprocket? I think you’re over thinking something here. Seriously, drop a tooth at a time till you’re happy...

            1 Reply Last reply
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            • Stevie WonderS Offline
              Stevie WonderS Offline
              Stevie Wonder
              wrote on last edited by
              #16

              You got sumo’s + 4DL trans aint you?

              Dropping a tooth at the front makes the gears too short sadly, you'd need to adjust from the back which would require renthal making me a sprocket or somehow finding one.

              Don’t get me wrong I’ve took the bike out a bit recently and changed the way I’ve been riding it and it’s been a lot of fun, it just requires more carefully timed shifting and clutch. Through 1st to 4th

              Best way I could explain it is before on the original setup, it’s like you’d hit band in first then straight away shift into second then zip through the gears

              As where now you get to power band and rather then zipping through you’re sat there letting it Rev and Rev waiting for it to reach to the end of the power curve so you can change up, it’s very reminiscent of a 4/ 125

              Theoretically having that wheel should up the top speed but practically it’s made it slower

              CalumC 1 Reply Last reply
              0
              • Stevie WonderS Stevie Wonder

                You got sumo’s + 4DL trans aint you?

                Dropping a tooth at the front makes the gears too short sadly, you'd need to adjust from the back which would require renthal making me a sprocket or somehow finding one.

                Don’t get me wrong I’ve took the bike out a bit recently and changed the way I’ve been riding it and it’s been a lot of fun, it just requires more carefully timed shifting and clutch. Through 1st to 4th

                Best way I could explain it is before on the original setup, it’s like you’d hit band in first then straight away shift into second then zip through the gears

                As where now you get to power band and rather then zipping through you’re sat there letting it Rev and Rev waiting for it to reach to the end of the power curve so you can change up, it’s very reminiscent of a 4/ 125

                Theoretically having that wheel should up the top speed but practically it’s made it slower

                CalumC Online
                CalumC Online
                Calum
                wrote on last edited by
                #17

                @Stevie-Wonder I wouldn't exactly call them Sumo and no I'm on stock DTRE transmission.

                Aprilia RS 125 wheels and DTRE transmission. So it's a considerable change from the stock wheel setup and I think the gearing is fine. Tops out at about 70mph though 🤣 but I'm not 17 anymore and weigh considerably more.

                Rides lovely though and for zipping to and from town it's a perfect little bike.

                Always Originate, Never Pirate!

                1 Reply Last reply
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                • Stevie WonderS Offline
                  Stevie WonderS Offline
                  Stevie Wonder
                  wrote on last edited by
                  #18

                  Update the sidewall height of both tires I run on both wheels where the same, I’m not sure what an extra inch added equates to in terms of sprocket teeth but it explains a bit

                  Also no @SpookDog of course not, although I do need to buy a socket the right size that’ll fit the nut on the sprocket so I can experiment with a couple sprockets. Ya never know I might not be able to replicate the ratio but I could possibly get a nice medium between them both.

                  I think realistically though the stock gearing is the best without compromise for using the bike about town and off-road, which along with the occasional long road trip or weekend camping trip is what I need it for.

                  Also @Calum she sound good, may only do 70 but I bet she gets there pretty flipping quick

                  B 1 Reply Last reply
                  0
                  • Stevie WonderS Stevie Wonder

                    Update the sidewall height of both tires I run on both wheels where the same, I’m not sure what an extra inch added equates to in terms of sprocket teeth but it explains a bit

                    Also no @SpookDog of course not, although I do need to buy a socket the right size that’ll fit the nut on the sprocket so I can experiment with a couple sprockets. Ya never know I might not be able to replicate the ratio but I could possibly get a nice medium between them both.

                    I think realistically though the stock gearing is the best without compromise for using the bike about town and off-road, which along with the occasional long road trip or weekend camping trip is what I need it for.

                    Also @Calum she sound good, may only do 70 but I bet she gets there pretty flipping quick

                    B Offline
                    B Offline
                    biohazard13
                    wrote on last edited by
                    #19

                    @Stevie-Wonder
                    The difference between a 3.50 standard tyre and a 4.00 is a half inch. I corrected that gearing on my bike by dropping 1 tooth from 17 to 16. If you have a 17 front cog try searching ebay for a 15 tooth Jt front dtr125 sprocket. They are about 6 quid...

                    Whether you drop the front or raise the rear, its still the same. You are lowering the gearing. You want it 'shorter'...

                    SpookDog...

                    1 Reply Last reply
                    1
                    • Stevie WonderS Offline
                      Stevie WonderS Offline
                      Stevie Wonder
                      wrote on last edited by Stevie Wonder
                      #20

                      As it happens I think I actually have a 15” sprocket in my garage, anyone know what size the sprocket bolt is?

                      1 Reply Last reply
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