Mount a bit bigger motor sprocket ?

[NervEasy]

Hi,

I speak Dutch and my French is terrible… But I’m an RnD engineer from Belgium and my TC-max is being delivered either next week or the week thereafter. I’m very interested in trying to mount a bit bigger motor sprocket.

https://www.imes.be/tl-tandriemsch-polychain-32-8mx-12-1610-2f.html

Maybe as mentioned earlier a 32 teeth sprocket can give us that bit higher topspeed (and a little less torque in the low end) without needing to change the belt?

Can anyone with a TC-Max check if the rearweel can be mounted a bit more forward (like +- 1cm?) to get a little bit more slack in the belt?

Sorry that I’m talking in English, I understand if this violates forum rules and if this post will be deleted because of it.

[GrumpyRider]

Hi @nerveasy,

Your post is now the first english topic of our forum !
Do not forget to introduce yourself in Introduce Yourself.

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[NervEasy]

😀 great Thanks!

 

PS: is it possible to change the title of the post to « Mount a bit bigger motor sprocket? »

• Cette réponse a été modifiée le il y a 5 années et 6 mois par NervEasy.

[GrumpyRider]

@nerveasy done.

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[NervEasy]

Thx!

[GrumpyRider]

NervEasy wrote:

Maybe as mentioned earlier a 32 teeth sprocket can give us that bit higher topspeed (and a little less torque in the low end) without needing to change the belt? Can anyone with a TC-Max check if the rearweel can be mounted a bit more forward (like +- 1cm?) to get a little bit more slack in the belt?

Maybe you could find some answers in this video we shot last week (at 7mn47) (english sub available)

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[Dam’s]

Hello @nerveasy

 

As a frist answer, it seems possible to switch from a sprocjet with 30 teeth to 32 teeth : the change of distance between axis will not be so important.

Some dimensions miss me (number of teeth on the rear sprocket), but I will try to calculate soon the impact of this change of front sprocket (it is clearly a « simple » solution to increase the speed of the TC MAX).

Cool, une TC noire dans le garage !

[NervEasy]

Yes, as long as the keyway on the small sprocket is something that is either easily copied or even beter if it is the same as a stock sprocket linked earlier:

https://www.imes.be/tl-tandriemsch-polychain-32-8mx-12-1610-2f.html

We need to find somebody that has a TC-Max willing to remove the small sprocket  to check. As soon as I have mine I want to do that but it could take several weeks before mine arrives 🙁

I’m looking voor a 10-15km/h increase… I think the motor/controller could still handle probably.

The speed reading on the speedo will be incorrect after a modification on the sprockets I think as the controller only recalculates the motor RPM and it assumes the standard sprocket ratio is used. But that is only a minor nuissance

 

[Dam’s]

The best is to use a sprocket from the supplier GATES.

The sprocket in the TC Max is 8MX-30T-12 (as you can see in the video), and in the GATES catalog it exists the 8MX_32S-12. I did not find the signification of the « S » or the « T »… But it seems very close !

Cool, une TC noire dans le garage !

[Thomas]

Can someone explain me, with simple words :), why the sprocket system is the totaly contrary to the bike system (big wheel activated by feets and the small one on the rear wheel of the bike) ?

 

[zmo]

@tomtom if I’m not wrong, it does not really matter. what matter is to have a little sprocket and a big one, the goal being to multiply the rotation of the wheel using the size ratio between the two sprockets.

If the little one is on the engine, for each full rotation out of the engine, you’ll get a partial rotation of the big sprocket on the wheel. If the big one is on the engine, you’ll get more than a full rotation on the wheel.

But in both cases, if you do a full rotation of the big sprocket, you’ll have done the same distance on the road.

I guess the rationale for choosing either one is a matter of convenience for servicing. Also, on bike you often have several sprockets in front, and several on the back.

Because brushless electrical motors have such a $h!tload of torque, you don’t need a gearbox to change the ratio (though I guess with one we might have earned a few kph at max speed ?‍♂️ on the tcmax).

Now, don’t take my word for it, I’m good in electronics, much less in mechanical engineering ? Maybe someone will correct me or give more precisions on how!

[Auteur]

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