• Welcome to the new B.I.R.D. Forum. Please be sure to read the "New Member / New Registered ? Please Read" thread in the Coffee Shop. This contains some important information. To become a full member ( £5.90 a year ) simply click on your user name near the top on the right I hope you enjoy the new site ................ Jaws ( John )

Suspension

tsm23

Registered User
i have lowered the back of the bike by 3cm with a lowering kit and was advised to lower the front by the same I have done but it is to low looking and also hits the bike ramp when putting it on. Would I get away with lowering the front by say 2cm would it really make such a drastic change . the rear shock is set about half way down the threads would changing that make any difference. Or could I put a top spacer 6mm in the top of the rear shock. Hope u can follow all this any advice.
 

CBRDEAN0

Registered User
i have lowered the back of the bike by 3cm with a lowering kit and was advised to lower the front by the same I have done but it is to low looking and also hits the bike ramp when putting it on. Would I get away with lowering the front by say 2cm would it really make such a drastic change . the rear shock is set about half way down the threads would changing that make any difference. Or could I put a top spacer 6mm in the top of the rear shock. Hope u can follow all this any advice.

What was the reason for lowering it ?

The spacer will only reverse the lowering you have done

If it is short legs - I would look at a lowered & reshaped seat rather than lowering the bike.
 

tsm23

Registered User
That's my thinking I have lowered the bike cause of 29"legs but if I put a 6mm spacer in I am only lowering the bike by 24mm in effect yes? My thinking is this 6mm spacer increases the turn in lowering the ride height makes the bike harder to turn in so u must lower the front as well so if I lower the bike at the back by 3cm and put a spacer in then only lower the front by say 2cm I am only 4mm out of level yes or am I on another planet
 
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slim63

Never surrender
Club Sponsor
Rather than start yet another thread ............

Anyone know the stock position of the rings on the top of the spring? I think mine have been wound down a fair bit ! a measurement of the threads showing would be good
 

ianrobbo1

good looking AND modest
I honestly think the best "read cheapest" method of getting your feet on the floor, is put the bike back as it was "standard ride hight" and fit a slightly narrowed/lowered seat, it's what I did with the same inside leg, and then was able to mess about with the bike knowing I had a solid base to go back to if the "adjustments" proved unsatisfactory :dunno:
 

CBRDEAN0

Registered User
That's my thinking I have lowered the bike cause of 29"legs but if I put a 60mmspacer in I am only lowering the bike by 2400mm in effect yes? My thinking is this 60mm spacer increases the turn in lowering the ride height makes the bike harder to turn in so u must lower the front as well so if I lower the bike at the back by 3cm and put a spacer in then only lower the front by say 2cm I am only 40mm out of level yes or am I on another planet

the 6mm spacer will give more than 6mm lift - I think it is something like 18mm lift from it because the rear suspension is 3to1 ratio IIRC.
 

Jaws

Corporal CockUp
Staff member
Moderator
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Correct Deano..
TSM, the way you are messing about with the suspension you are going to end up with a bike that is going to handle like a rubber barge.

Remove the lowering kit, remove the 6mm spacer, lower the fork legs back down and THEN see how it feels

Changing the ride height with the dog bones ( or plates ) is one of the worst things that has ever come out.. It changes the way the rising rate linkages work and changes the rate the suspension alters.
It should always be a last resort thing



Slim, as a VERY rough guide because it depends on many variables, the preload rings should be set ABOUT a 1/4" from max
 

slim63

Never surrender
Club Sponsor
Slim, as a VERY rough guide because it depends on many variables, the preload rings should be set ABOUT a 1/4" from max

Thanks jaws that's all I needed @tu* being a lightweight I always have to mess with settings to suit me & just needed a start point
 

DLN1965

Moderator
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That's my thinking I have lowered the bike cause of 29"legs but if I put a 60mmspacer in I am only lowering the bike by 2400mm in effect yes? My thinking is this 60mm spacer increases the turn in lowering the ride height makes the bike harder to turn in so u must lower the front as well so if I lower the bike at the back by 3cm and put a spacer in then only lower the front by say 2cm I am only 40mm out of level yes or am I on another planet

Reckon you have a few problems riding ... If these measurements are correct ??
Bike dynamics and aerodynamics together with traction issues ...
60mm spacer ??? That's quite a lift !!

Lowered the bike by 2400mm ?? Have you dug a massive trench ???
That's quite a massive lowering ... Do you have a ladder to climb down to your bike ?? Maybe your riding a sub surface missile ???
If your measurements are anything like your calculations ....
Do not ride your bike !!!
Personally I would go back to normal and wear higher heels !!!
 

DLN1965

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Just in case you aren't good at maths

2400mm Is 240cm

Or 2.4 metres

In laymans terms

Lowered by 8ft ???????
 
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DLN1965

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Staff member
Moderator
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Oh .... And the 60mm spacer !!!!

In laymans terms is 2 1/2 inches !!
That's a huge spacer !!!!
:dunno:
 
S

Saffie

Guest
Oh .... And the 60mm spacer !!!!

In laymans terms is 2 1/2 inches !!
That's a huge spacer !!!!
:dunno:


Bloody hell! You do like making a point...think it was a error of 1 0 too much. Never doing a dick measurement competition with you! :whi5tl:
 

tsm23

Registered User
Yip u would think they would realise I had put in to many 0s. but it's more fun to take the piss. no matter I'm a sponsor now so I will take it on the chin, and send a couple of redundant west Belfast fellows to shorten their knee caps by let's say an inch is that about 2.5cm?
 

tsm23

Registered User
All I have done so far is lower the back and front as advised I haven't been out on her yet I just thought the front looked very low and wondered if I could put it up or does it have to stay the same as the rear. If I have to I will buy a lowered seat but they are ?260 for some foam and plastic seems a lot.
 
S

Saffie

Guest
Silly question, but do you have the standard seat on at the moment or has it been changed by aftermarket?

Raising the front too much will actually cause the bike to lift easier on take off and also make the front a bit looser on corners. If I was you I would play with a few different set ups as riding style influences these type of decisions a lot.

I usually take the bike to a quiet traffic circle(preferably a big one) and ride around it increasing speed and leaning as I go around till I feel uncomfortable with the front wheel grip. Thats just me as I am a cheapskate and try and fix thing using the tested Darwin theory in the process. :-0)
 

tsm23

Registered User
Have a standard seat Saffie I have lowered the back by 3cm and lowered the front by 3cm but I think the front looks very low.
 

Jaws

Corporal CockUp
Staff member
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Before you do anything remove that spacer and put the standard rising rate parts back on..

As mentioned, the spacer will give about an 18mm lift to the arse end

As to doing the front and back..
Ever ridden a chopper ? I mean a real one with longer forks..

By just lowering the rear you are effectively doing the same thing.. Increasing the angle the forks stick out.
The Bird is not exactly known for its quick agile turning as it is.. Dropping the rear down will amplify the issue 10 fold !
 
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