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| Whosthedaddy |
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Whosthedaddy
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Joined: 11 Dec 2005
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 Posted: 14:01 - 27 Aug 2009  Post subject: Suspension set up |
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Is getting a suspension to match you trial and error or is there a theory to follow? I'm not talking about professional sets ups, more a home with a spanner.
 Front.
The front end on the TRX feels softer than I would have thought for a bike of its size, and maybe a little easier to rebound the forks than the 7 when your weight is applied.
Apart from this maybe being standard, how much would a change of fork oil, different oil density or even new damping springs affect the front?
Is a soft or hard front end beneficial for riding.
I'm thinking harder than soft would be better but not sure what it would be like come bent over if its rigid as a rigid thing.
Rear
The easier one to adjust as it has a dial allowing for hard to soft.
https://www.yamaha-motor.gr/designcafe/en/Images/fig0_4%205_8_PS_tcm71-237305.jpg
My predicament is the following; the rider that I bought the bike from was quite a bit bigger (read heavier and taller) than me and bought the bike for him and the missus to go touring. His weight plus pillion set up makes the rear almost solid. I have a job to bounce on the rear when seated.
The feeling of bouncing off the seat when going over bumps or undulations due to it almost being solid is a little unnerving not only when on the straight but even more so when round a corner or bend.
Surely the rear has to have some give, but how much?
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Current : MSX 125 Past : CBR 900RR Monkeybike : c50 LAC : ZXR750 H2 : FZR600 : ZX7R P3 : YW100 : TRX850: Trophy 900 T309 : GSXR 600 L0: Monkeybike : XJ6S Whosthedaddy |
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| MarJay |
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MarJay
But it's British!
Joined: 15 Sep 2003
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Posted: 15:37 - 27 Aug 2009  Post subject: |
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That was a lot of faffing for you to write a whole post when the answer is forthcoming merely from the thread title.
https://www.marjay.co.uk/setup.pdf
That is a straightforward and simple home method of suspension setup. It won't get it track perfect, but it will give you an excellent baseline.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another. |
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| Whosthedaddy |
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Whosthedaddy
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| Posted: 17:41 - 27 Aug 2009 Post subject: |
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Cheers for that.
It would appear that the bike has only preload / rebound adjustments on the forks but has preload / rebound and compression on the rear.
I think its a read, read and read before adjusting to get the adjustments that are wanted rather than blindly twisting knobs and screws.
The hardest part would be to find a decent road to test the changes. Bit slim pickings round here!
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Current : MSX 125 Past : CBR 900RR Monkeybike : c50 LAC : ZXR750 H2 : FZR600 : ZX7R P3 : YW100 : TRX850: Trophy 900 T309 : GSXR 600 L0: Monkeybike : XJ6S Whosthedaddy |
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| MarJay |
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MarJay
But it's British!
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| Posted: 18:06 - 27 Aug 2009 Post subject: |
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| Whosthedaddy wrote: | Cheers for that.
It would appear that the bike has only preload / rebound adjustments on the forks but has preload / rebound and compression on the rear.
I think its a read, read and read before adjusting to get the adjustments that are wanted rather than blindly twisting knobs and screws.
The hardest part would be to find a decent road to test the changes. Bit slim pickings round here! |
My tips to add to that PDF are:
1.) Static sag is everything. The aim is that the sag with you sitting on the bike is at the bottom of the top third of suspension travel on the front and the rear. This is so the suspension has some room to move the wheels downwards as well as upwards. Most of the force imparted on the wheels is upwards, but some of it is downwards hence why you're 2/3rds of the way up the suspension travel when at rest.
2.) Don't get hung up on whether or not the suspension should be 'hard' or 'soft'. It is totally pointless to say 'hard' is better or 'soft' is better. Firstly because they have no meaning, you can't change the spring rate in your bike, only the preload and secondly because you want the bike to be not too hard or not to soft for want of a better description. 'hard' isn't better, and neither is 'soft'. If it were that easy we'd either be all riding around on jelly bikes or on bikes made of pure granite. The key is compromise.
3.) don't worry if the damping adjusters don't appear to have too much effect. Not many bike manufacturers make adjustable suspension which is so adjustable as to make the bike unrideable at extremes. This is probably for litigation purposes. As with preload, it is possible to have too much damping as well as too little, so don't just jack up all the adjusters to the max.
4.) have fun. Remember that a lot of 'suspension' issues are down to poor tyre pressures, or psychological barriers. Once you've got a base line setup that you're happy with, don't mess around with it too much because you'll only end up chasing the impossible.
____________________
British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another. |
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| Whosthedaddy |
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Whosthedaddy
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| Posted: 18:23 - 27 Aug 2009 Post subject: |
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It did make me smile a little at the first thing to check...the tyres and the fact that 'you should have a matching pair'. I fail! I have BT014 on the rear (no complaints so far) and a Michelin somethingorother on the front (jury's out a little on this one).
How much this affects the feel of the bike? Who knows as it could all be in the head. The handling of a bike feels different be it good or bad when new tyres are fitted.
____________________
Current : MSX 125 Past : CBR 900RR Monkeybike : c50 LAC : ZXR750 H2 : FZR600 : ZX7R P3 : YW100 : TRX850: Trophy 900 T309 : GSXR 600 L0: Monkeybike : XJ6S Whosthedaddy |
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Old Thread Alert!
The last post was made 17 years, 16 days ago. Instead of replying here, would creating a new thread be more useful? |
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