22 replies to this topic

[sayhello]

hi dear friends,

 

 

i am lookinf for a sprocket that fits on the TDM 900  - note i want to go from 

 

original 16/42 to 

new 18/37 or 36 teeth 

 

 

so the gearing should be taller - to commute and lower the rpm

 

 

 

now i look for rear sprocket 

 

 

well see the original sprocket: 

 

 

https://mtp-racing.d...c4aAls8EALw_wcB

 

Kettenrad Stahl JT Sprocket 42 Zähne

für Modell: Yamaha TDM 900 A RN18 2007-2013

Die JT Sprockets Fertigung ist heute die größte und modernste Produktionsstätte für Ritzel und Kettenräder weltweit. JT Sprockets produziert das gesamte Programm von Ritzeln und Kettenrädern für den Aftermarkt und die Erstausrüstung

Nach der anschließenden Hitzevergütung wird jeder Artikel von Hand geprüft

Merkmale:

Die verzinkte Oberfläche verlängert die Haltbarkeit des Kettenrades

perfekt für sportliches Fahren geeignet

mittels CNC Datentechnik gefräst; ein Verfahren, das eine 100%ige Genauigkeit und Präzision bietet

Technische Daten:

Teilung 525 / Inndendurchmesser 130mm

Lochkreis 150mm / Bohrung 10,5mm / Gewicht 750 gramm

Lieferumfang

1 x Kettenrad Stahl

 

 

see this one 

 

https://mtp-racing.d...c4aAls8EALw_wcB

 

 

 

here:  with 39 teeth 

https://alphatechnik...5/23-164-010-39

 

 

 

here:  with 36 teeth 

 

Stahl-Kettenrad AFAM 520 - 36Z (Silber) 10406-36, ID 70 LK 110 4-Loch für Honda CB CM

Artikel passt zu folgenden Fahrzeugen - This Part fits to:

Honda: CB, CM

 

https://www.ebay.de/...i8aAlPEEALw_wcB

 

 

 

btw -  what about the swing arm - does it get damaged if i run  this combination - 18 / 36 or 37 ?

 

 

awesome - do you think that this last one fits 

 

 

look forward to hear from you 

here:  with 39 teeth 

[Catteeclan]

Don't think anyone on here has gone to the extremes you want.

You'll have to let us know how you get on.

[dapleb]

...but do it in the forum rather than individual PMs. (⁠◠⁠‿⁠◕⁠)

[Snowbird]

And try and keep it in the same thread.

[sayhello]

hi there - many thanks for the replies. 

awesome.  weil i am looking for a sprocket that fits 

 

with 36 or 37 teeth 

 

any idea - for a off the shelf - part would be great!

 

 

thanks in advance for any and all help

[fixitsan]

hi there - many thanks for the replies. 

awesome.  weil i am looking for a sprocket that fits 

 

with 36 or 37 teeth 

 

any idea - for a off the shelf - part would be great!

 

 

thanks in advance for any and all help

 

Apologies if I missed this but, what specifically is the reason behind changing the gearing, presumably you've identified an issue with the standard equipment you wish to change ?

[sayhello]

hi there - many thanks for the reply. 

 

what is aimed: 

 

i want to lowwer the  rpms 

i guess that the tdm has got lot of  power and can cope easily with  a changed gearing

 

some of us  - i guess allready did this 

 

uldate: 

Favs runs a 39 rear sprocket and is very very happy with it

http://www.carpe-tdm...?showuser=33780

 

i wwant to do the same - at leas this - i also want ot do such awesome things..

Edited by sayhello, 18 August 2023 - 09:06 am.

[fixitsan]

 

hi there - many thanks for the reply. 

 

what is aimed: 

 

i want to lowwer the  rpms 

i guess that the tdm has got lot of  power and can cope easily with  a changed gearing

 

some of us  - i guess allready did this 

 

uldate: 

Favs runs a 39 rear sprocket and is very very happy with it

http://www.carpe-tdm...?showuser=33780

 

i wwant to do the same - at leas this - i also want ot do such awesome things..

 

 

The only change I have made, was to drop the front sprocket -1 tooth

This gave better acceleration, smoother low rpm pickup, and the impact on economy wasn't notably large.

 

From what I understand about Favs, he is tiny, light, he regularly runs marathons and eats carefully, and rides only at the speed limit.....are those also your parameters ?

Edited by fixitsan, 18 August 2023 - 10:07 am.

[Favs]

[Catteeclan]

Tee hee

[dablik]

From what I understand about Favs, he is tiny, light, he regularly runs marathons and eats carefully, and rides only at the speed limit.....are those also your parameters ?

 

    Liar liar pants on fire.

[PICARD]

Not so fast cliff.....a man can change.....

[thong]

 

The only change I have made, was to drop the front sprocket -1 tooth

This gave better acceleration, smoother low rpm pickup, and the impact on economy wasn't notably large.

 

 

is there an easy/cheap way to correct the speedo after dropping 1 tooth, thx

[fixitsan]

From what I understand about Favs, he is tiny, light, he regularly runs marathons and eats carefully, and rides only at the speed limit.....are those also your parameters ?

 

    Liar liar pants on fire.

 

is there an easy/cheap way to correct the speedo after dropping 1 tooth, thx

Speedo ?

 

The round bit with a pointy thing ?

 

To be honest I'm not sure there's something off the shelf, I didn't look into it as I deemed it unnecessary. I calibrated with my phone's GPS speedo and remembered to adjust for the difference.

 

I considered making an electronic compensator, but just didn't find the time to do it

[fixitsan]

 

Speedo ?

 

The Digit's display thing ?

 

To be honest I'm not sure there's something off the shelf, I didn't look into it as I deemed it unnecessary. I calibrated with my phone's GPS speedo and remembered to adjust for the difference.

 

I considered making an electronic compensator, but just didn't find the time to do it

 

GPS speedo ? £12.95, almost certainly not waterproof but could be helped with silicone ?

https://www.ebay.co....:BlBMUJLtyfLBYg

 

 

Waterproof GPS speedo for £51

https://www.ebay.co....kp:BFBM0PrD8sFi

Edited by fixitsan, 19 August 2023 - 07:05 pm.

[thong]

 

GPS speedo ? £12.95, almost certainly not waterproof but could be helped with silicone ?

 

 

 

Waterproof GPS speedo for £51

 

gps speedo, thats the best idea, thank you sir

[sayhello]

hi dear friends 

 

 

can i replace this stock 

 

 

stock: 42 teeth 

https://www.getor.de...-Yamaha-TDM-900

 42_teeth_525_pitch_.jpg   22.56KB   0 downloads

 

 

with that one here 

 

mod: 36 teeth 

https://www.getor.de...tch-525-080-110

 36_teeth_525_pitch_.jpg   20.17KB   0 downloads

 

 

the only thing is that we need to rework the whole thing a bit - in order tofint all the needs

 

 

 

[steve27bha]

No.

 

The PCD of the mounting bolts is different - very different - 110 vs 150. so it won't bolt to the wheel.

 

Why not simply ride one or two gears higher than normal? Start in 2nd (and burn the clutch) and change up early? If you are commuting do you ride at high speed?

 

You propose a change in gearing of at least  27.7% - that is extreme. So much so that I went back to the original posting to check it wasn't 1st April.

 

There would also possibly be chain clearance problems.

 

A Google search found 37 tooth rear sprockets for TDM900.

 

SpeedoHealer might correct speedo and odometer errors. Unless yours is an ABS model which needs no correction for gearing.

Edited by steve27bha, 12 October 2023 - 10:22 pm.

[dandywarhol]

@sayhello

 

I suggest you use this first then reconsider https://www.gearingcommander.com/

[Snowbird]

If you need to change more than 2 teeth at the front or 3 teeth at the back I would say the thing that is needing changed is the whole bike, yamaha spent lots of time designing the bike and gearing to suit and they likely know better than most of us apart from minor changes for personal usage.
Gear it too high and it just won't pull it in top gear so you'll end up in a lower gear anyway.