Tyre rubbing undertray - rear shock issue?

Snorty · World Chat Champion Joined: 13 Oct 2010 Karma :

https://fbcdn-sphotos-c-a.akamaihd.net/hphotos-ak-xpa1/t1.0-9/936056_10154323363440332_6942523193335015528_n.jpg

https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-xfp1/t1.0-9/10479157_10154323363460332_2792949814669779227_n.jpg

https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-xfp1/t1.0-9/983728_10154323363450332_3425651781973888010_n.jpg

It's an aftermarket undertray which came with the bike, but the tyre seems to be catching it. The bike is running a 180/60/17 but it's supposed to have a 190/50 as stock, which seems like it would be even worse.

So what's the issue here? The bike seems to have enough damping and it's a pretty hard suspension on front and rear.

When I sit on it there's probably about an inch before the tyre hits the undertray. Is the shock dead? Set up wrong? When I take pillions it's pretty much a given the tyre will hit the undertray, especially on the shite roads.
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Current: Yamaha FZ1 '07 | GSXR 750 SRAD

Past: CB125TDC | TZR125 | GPZ500 | CBR600F3 | ZX9-R | GSXR1000 K4

sickpup · Old Timer Joined: 21 Apr 2004 Karma :

This thread is funny for so many reasons that you probably don't appreciate. If you manage to not spit your dummy out of the pram I may post something useful later.

_Iain_ · Banned Joined: 01 Feb 2012 Karma :

You've fitted a higher profile rear tyre Laughing

180 is the width, 60 is the aspect ratio (can be used to work out profile), 17 is the wheel size.

Have a look at a few online calculators.
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sickpup · Old Timer Joined: 21 Apr 2004 Karma :

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

Whoah there Peter Fonda! Wink

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Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

Snorty · World Chat Champion Joined: 13 Oct 2010 Karma :

I'm not going to "spit my dummy out of the pram" so to speak.

So we're playing the guessing game.

Preload? The undertray is not for this bike? The undertray is a piece of shit? We could do hot or cold as well.
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Current: Yamaha FZ1 '07 | GSXR 750 SRAD

Past: CB125TDC | TZR125 | GPZ500 | CBR600F3 | ZX9-R | GSXR1000 K4

iooi · Super Spammer Joined: 14 Jan 2007 Karma :

I would guess a combination of a knackered shock and a undertray that is wrong.
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pdg · World Chat Champion Joined: 15 Sep 2012 Karma :

I have a few words in mind about this, but I'm entertained by pup's tack.
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sickpup · Old Timer Joined: 21 Apr 2004 Karma :

Rob W · World Chat Champion Joined: 09 Nov 2004 Karma :

Here's a pic of my SRAD sitting on a working rear shock with what is probably the same undertray.

[img]https://i1212.photobucket.com/albums/cc449/Rob-W-1983/IMG_20140518_161800_zps39818a7c.jpg
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'90 TS50 > '04 Senda 125 > '91 ZXR400 > '90 CB-1 > '04 GSX-R1000 > '96 Bandit 600 > '89 ZXR750 H1 > '96 GSX-R750 SRAD > '98 RR-W Fireblade > '98 T595 Daytona > '03 Hornet 900 > '04 Fireblade > '16 GSX-S1000F (x2) > '23 XSR900

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

either your shock is dead or you are missing a vital part of the linkage Shocked

low rider yo

Fisty · Super Spammer Joined: 11 Apr 2007 Karma :

https://www.youtube.com/watch?v=6A0U7jakUY8
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Fatter and faster than Fret

ripzay · Nitrous Nuisance Joined: 01 Dec 2008 Karma :

... Or a previous owner has lowered it by changing the length of the dogbones on the linkage.. was the person you bought it from vertically challenged? :p
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Previous: 1994 Suzuki GSX-R 400

Northern Monkey · World Chat Champion Joined: 17 Nov 2013 Karma :

Maybe you just need to visit Greggs a little less frequently,
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Snorty · World Chat Champion Joined: 13 Oct 2010 Karma :

The dog bones are standard I believe (they have 33E stamped on them).

That SRAD looks a lot higher than mine. I'm guessing the rear shock is fucked then - probably the original one still.
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Current: Yamaha FZ1 '07 | GSXR 750 SRAD

Past: CB125TDC | TZR125 | GPZ500 | CBR600F3 | ZX9-R | GSXR1000 K4

Fisty · Super Spammer Joined: 11 Apr 2007 Karma :

Could the subframe be twisted? Wink

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TL1000R | Hayabusa | ZXR400 | TL1000S | Bandit 400 V
Fatter and faster than Fret

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

Three words.

Ride

Height

Adjuster.

Wink

____________________
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.

Snorty · World Chat Champion Joined: 13 Oct 2010 Karma :

The pre-load? The bit that requires a c-spanner?
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Current: Yamaha FZ1 '07 | GSXR 750 SRAD

Past: CB125TDC | TZR125 | GPZ500 | CBR600F3 | ZX9-R | GSXR1000 K4

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

Snorty · World Chat Champion Joined: 13 Oct 2010 Karma :

Can't find anything in the Haynes Manual.
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Current: Yamaha FZ1 '07 | GSXR 750 SRAD

Past: CB125TDC | TZR125 | GPZ500 | CBR600F3 | ZX9-R | GSXR1000 K4

Fisty · Super Spammer Joined: 11 Apr 2007 Karma :

Take a picture of the top of the shock, the very top of it where it bolts to the frame.
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Quietly and consistently taking the piss.
TL1000R | Hayabusa | ZXR400 | TL1000S | Bandit 400 V
Fatter and faster than Fret

sickpup · Old Timer Joined: 21 Apr 2004 Karma :

I'm confused as to why some people think its a duff shock? The only way it could be is if the spring was broken.

Snorty · World Chat Champion Joined: 13 Oct 2010 Karma :

evoboy · World Chat Champion Joined: 20 Aug 2009 Karma :

Subframe looks bent.

Angle on the swingarm looks ok from the small amount that can be seen in one of the pics.

Although, it could be a combo of a few things!
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Snorty · World Chat Champion Joined: 13 Oct 2010 Karma :

https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-xpf1/t1.0-9/10492384_10154326784085332_3891180413842808778_n.jpg

https://scontent-b-fra.xx.fbcdn.net/hphotos-xfp1/t1.0-9/10404223_10154326784080332_4049553142520834609_n.jpg

Yes, it's filthy.
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Current: Yamaha FZ1 '07 | GSXR 750 SRAD

Past: CB125TDC | TZR125 | GPZ500 | CBR600F3 | ZX9-R | GSXR1000 K4