WTB: derbi rear sprocker 24T < 38T

Emil Kniemel /

I have a flatreed with a 16T front. Currently have a 38T rear but want more top speed.

415 chain if that sorta stuff matters.

479E20A7-FF46-463A-894F-C20D7069A101.jpeg

Re: WTB: derbi rear sprocker 24T < 38T

Derbis ain’t like puchs, adding more gear won’t really get you much more top speed. Especially since you’re already using a 16t front sprocket. Try some exhaust porting.

Re: WTB: derbi rear sprocker 24T < 38T

> Daniel '' Wrote:

> -------------------------------------------------------

> Derbis ain’t like puchs, adding more gear won’t really get you much more

> top speed. Especially since you’re already using a 16t front sprocket.

> Try some exhaust porting.

YUP, even with a good kit/pipe a 16t front sprocket is too much. Being dual variated you need to be able to get it up in the rpms for it to run. MOST people can get 50 to low 60's in stock gearing. Looks like you have a big muff pipe. What carb and top end?

Re: WTB: derbi rear sprocker 24T < 38T

Emil Kniemel /

> Stephen Simmons Wrote:

> -------------------------------------------------------

> > Daniel '' Wrote:

>

> > -------------------------------------------------------

>

> > Derbis ain’t like puchs, adding more gear won’t really get you much

> more

>

> > top speed. Especially since you’re already using a 16t front sprocket.

>

> > Try some exhaust porting.

>

> YUP, even with a good kit/pipe a 16t front sprocket is too much. Being

> dual variated you need to be able to get it up in the rpms for it to

> run. MOST people can get 50 to low 60's in stock gearing. Looks like you

> have a big muff pipe. What carb and top end?

50cc gila and amal 15mm.

If i go UP to a 42T in the back that will bring back to closer stock gearing and could be faster?

Re: WTB: derbi rear sprocker 24T < 38T

Emil Kniemel /

> Emil Kniemel Wrote:

> -------------------------------------------------------

> > Stephen Simmons Wrote:

>

> > -------------------------------------------------------

>

> > > Daniel '' Wrote:

>

> >

>

> > > -------------------------------------------------------

>

> >

>

> > > Derbis ain’t like puchs, adding more gear won’t really get you much

>

> > more

>

> >

>

> > > top speed. Especially since you’re already using a 16t front

> sprocket.

>

> >

>

> > > Try some exhaust porting.

>

> >

>

> > YUP, even with a good kit/pipe a 16t front sprocket is too much. Being

>

> > dual variated you need to be able to get it up in the rpms for it to

>

> > run. MOST people can get 50 to low 60's in stock gearing. Looks like

> you

>

> > have a big muff pipe. What carb and top end?

>

> 50cc gila and amal 15mm.

>

> If i go UP to a 42T in the back that will bring back to closer stock

> k gearing and could be faster?

Faster as in keeping my RPMs up. Ive read that yeah need to be at 10k RPM at top speed which i dont think im hitting. My pipe isnt prolly helping and my weights are the lowest i got. Im down to less than 12 with 3 weights. I will see if i can drill them out to 10gs total.

Full disclosure this is the only second bike ive really put effort in. First one being a hobbit that kept the stock gearing. So the gearing stuff is new to me.

Re: WTB: derbi rear sprocker 24T < 38T

10g is WAY light, are you sure your fully variating? That would be your top lack of top end speed if your not

Re: WTB: derbi rear sprocker 24T < 38T

Emil Kniemel /

I did the mark the moveable face. There seems to be maybe like 3mm or so left before it rounds out to the outside. So not sure if thats full or not. I guess i should try it on the stand to see if it rubs off completely.

In conclusion: i dont need to worry about a new rear sprocket it seems.

Re: WTB: derbi rear sprocker 24T < 38T

todd amundson /

Put six 2.8’s in there.

Re: WTB: derbi rear sprocker 24T < 38T

Emil Kniemel /

> todd amundson Wrote:

> -------------------------------------------------------

> Put six 2.8’s in there.

90% i tried this and was barely breaking 37. I remember going with this weight since i think my hobbit is similar. But the hobbit is 70cc polini.

Re: WTB: derbi rear sprocker 24T < 38T

3 stock weights is the best

Re: WTB: derbi rear sprocker 24T < 38T

> Daniel '' Wrote:

> -------------------------------------------------------

> 3 stock weights is the best

Durr! How dose everyone not know this allready? Crazy!

Re: WTB: derbi rear sprocker 24T < 38T

Emil Kniemel /

I never had stock weights. What do they weigh?

Re: WTB: derbi rear sprocker 24T < 38T

Brandon Weiss (Detective brandon to you) /

> Emil Kniemel Wrote:

> -------------------------------------------------------

> I never had stock weights. What do they weigh?

6 grams each, for a total of 36 grams in a 6 roller

Re: WTB: derbi rear sprocker 24T < 38T

Emil Kniemel /

> Brandon Weiss (Detective brandon to you) Wrote:

> -------------------------------------------------------

> > Emil Kniemel Wrote:

>

> > -------------------------------------------------------

>

> > I never had stock weights. What do they weigh?

>

> 6 grams each, for a total of 36 grams in a 6 roller

So 18gs to equate 3 OG weight. Seems heavy but i have a combination of 6 weights that should add up.

Re: WTB: derbi rear sprocker 24T < 38T

Brandon Weiss (Detective brandon to you) /

> Emil Kniemel Wrote:

> -------------------------------------------------------

> > Brandon Weiss (Detective brandon to you) Wrote:

>

> > -------------------------------------------------------

>

> > > Emil Kniemel Wrote:

>

> >

>

> > > -------------------------------------------------------

>

> >

>

> > > I never had stock weights. What do they weigh?

>

> >

>

> > 6 grams each, for a total of 36 grams in a 6 roller

>

> So 18gs to equate 3 OG weight. Seems heavy but i have a combination of 6

> weights that should add up.

I think it should be fine for tuning purposes, but once you find the right weight, you should run 6 identical rollers. Running less weights or mixed weights isnt ideal for longevity

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