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Lowering A Tdm 900


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#1 Bro57

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Posted 04 September 2019 - 02:42 pm

If you lower the rear end of a TDM 900 rn18, shouldn't you lower the front end as well?



#2 Hombre

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Posted 04 September 2019 - 04:53 pm

I'm no chassis geometry expert but many owners move the front forks up the yokes (tripletrees) 10 - 12mm to sharpen the handling.


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#3 Robodene

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Posted 04 September 2019 - 06:05 pm

It sharpens the steering if you only lower the rear.
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#4 ChrisG

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Posted 04 September 2019 - 06:29 pm

Won't lowering the rear dull the steering?  Lots of people drop the front a bit to sharpen the steering so surely lowering the rear would have the same effect as raising the front?


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#5 TKH

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Posted 04 September 2019 - 06:51 pm

+1 Lower the front to sharpen up the steering.



#6 chrisr

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Posted 04 September 2019 - 07:44 pm

If you want it to handle the same the answer is yes

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#7 Robodene

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Posted 04 September 2019 - 09:29 pm

Yes, sorry I got that the wrong way round.
1940s Ariel 350 (ex-military) Khaki > Black & White '56' Kymco Venox 250 Metallic Grey '56' TDM 900/A (ABS) Silver[b] '56' Yamaha MT-03 White <p>[b] '14' Yamaha MT-07 Matt Grey[b] '17' Honda Rebel 500 

#8 Bro57

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Posted 05 September 2019 - 07:03 am

Thanks for your opinions, it's always nice to get some input.
I think I will lower the front as well, will not lose any of the sharpness of the steering.



#9 ChrisG

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Posted 05 September 2019 - 10:32 am

Pretty sure some people have had custom seats to bring the height down a bit too which might be another option youp look at. More expensive than longer dogbones though

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#10 TKH

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Posted 05 September 2019 - 01:21 pm

Just be careful if you have a main stand as it can scrape the ground on corners depending on which you have.

Also your side stand may/probably will need modifying.


Edited by TKH, 05 September 2019 - 01:22 pm.


#11 Studley Ramrod

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Posted 06 September 2019 - 12:48 pm

You may also need to up the suspension settings on the rear slightly.


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#12 Boosh

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Posted 31 July 2023 - 07:27 am

Excuse the dormant/dead thread resurrection!

 

All good points above, has anyone tried this for any reason other than having a short inside leg measurement?

 

I am around 5'10", and can get both feet on the ground but, apart from the above things to look out for, wouldn't lowering the bike make manoevering it easier, even if it wasn't a particular problem before?

 

Also, wouldn't lowering the bike give the benefit of slightly reducing the rocking/pivoting motion, when the bike hits a bump etc, as the C of G (or Centre of Mass) gets closer to the ground?

 

Some of the shortened dogbones are quite reasonably priced. Anyone gone down this route for, er, the less-obvious reasons?


Edited by Boosh, 31 July 2023 - 07:55 am.


#13 fixitsan

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Posted 31 July 2023 - 09:48 am

Excuse the dormant/dead thread resurrection!

 

All good points above, has anyone tried this for any reason other than having a short inside leg measurement?

 

I am around 5'10", and can get both feet on the ground but, apart from the above things to look out for, wouldn't lowering the bike make manoevering it easier, even if it wasn't a particular problem before?

 

Also, wouldn't lowering the bike give the benefit of slightly reducing the rocking/pivoting motion, when the bike hits a bump etc, as the C of G (or Centre of Mass) gets closer to the ground?

 

Some of the shortened dogbones are quite reasonably priced. Anyone gone down this route for, er, the less-obvious reasons?

 

If you laid the bike on it's side and supported the wheels on a plank connected to scales, and rested the handlebar end on another set of scales, then movnig the centre of mass towards the wheel side scales will increase the load on those scales. If the distance between wheel base and handlebars are 120cm, and you lower by 1cm, then you're making a vary small change.

 

Important to note is with the bike on it's side like that you get the maximum weight shift effect, manouvering the bike around with lean angles of less than 15 degrees i don't think you would notice anything, particularly if you're sat on the bike.

 

If you wanted to test it out and you're not too heavy, turn spring preload down to it's minimum front and back, that will safely lower the bike a little once you sit on it


Edited by fixitsan, 31 July 2023 - 10:00 am.

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#14 AdamTDM

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Posted 31 July 2023 - 03:26 pm

Shorter dog bones = higher bike

Longer dog bones = lower bike


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#15 Boosh

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Posted 02 August 2023 - 02:24 pm

Thanks very much for the explanation and the additional info . Cheers!




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