Getting Twisting Flex In My Rear Suspension

Postby foremannz on Mon 10/Jun/13 3:25pm

I've started noticing I'm getting twisting flex in my rear suspension, which keeps throwing out my rear disk brake alignment - would a bigger rear axle be needed, or whats the fix?
I have used a 2nd set of known reliable disk brakes on the bike, and they don't solve the problem, so I'm confident its not the brake calipers causing the problem.
My rear shock is at 250psi, which is probably the thing that has made it more apparent - I used to run it at 160psi, but that was far too soft.

Bike: 2008 Giant Yukon SX
Hub: Shimano RM65
Giant Yukon 2008.jpg
foremannz
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Member for: 9 years 4 months

Re: Getting Twisting Flex In My Rear Suspension

Postby shmoodiver on Mon 10/Jun/13 3:33pm

Czech your bearings, pivot and hub
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"There he goes. One of God's own prototypes. A high-powered mutant of some kind never even considered for mass production. Too weird to live, and too rare to die."
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Re: Getting Twisting Flex In My Rear Suspension

Postby foremannz on Mon 10/Jun/13 3:40pm

Please be a bit more descriptive - should they be replaced, tightened, what?
I checked the tension and they all seem ok.
foremannz
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Re: Getting Twisting Flex In My Rear Suspension

Postby Jimmy_Riddle on Mon 10/Jun/13 5:15pm

Sell the Giant and get a proper bike. They have a hinge in the middle
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Re: Getting Twisting Flex In My Rear Suspension

Postby dragon_style on Mon 10/Jun/13 5:47pm

Is the rotor straight? And tight? If it is the disc rotor that came with the hub then it is probably going to be affected by heat pretty easily.
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Re: Getting Twisting Flex In My Rear Suspension

Postby thelivo on Mon 10/Jun/13 5:52pm

Jimmy_Riddle wrote:Sell the Giant and get a proper bike. They have a hinge in the middle


Probly a bit harsh.

However to the OP, if you have been riding the bike for 5 years, things are wearing out and your riding is now stretching the bike's limits it might be time for an upgrade? Just a thought. If you like the Giant the higher end models can usually be had at pretty good prices.
And to answer your original point, the last time I rode a bike that felt it was hinged in the middle in the wrong direction it was a hardtail. Turned out to be the hub - cones were loose. Aside from that, listen to Schmoo and the others here who know their stuff!
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Re: Getting Twisting Flex In My Rear Suspension

Postby foremannz on Mon 10/Jun/13 6:11pm

Oh, one thing I did forget to mention is if I lean the bike to one side, it changes the alignment of the rotor.

I like the rear suspension bit, so I still want a full shock. I'm finding in my unfit state, a full shock allows me to ride further - the urban bike and the road bike are still pretty tiring on the Auckland cycleways as I have to stand up alot to take the bumps
I replaced the disks with some RT67's as the origonals had warped - problem remains.
foremannz
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Member for: 9 years 4 months

Re: Getting Twisting Flex In My Rear Suspension

Postby Wobbler on Mon 10/Jun/13 6:15pm

something is fucked, take it to a bike shop
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Re: Getting Twisting Flex In My Rear Suspension

Postby Trail on Mon 10/Jun/13 6:26pm

Wobbler wrote:something is fucked, take it to a bike shop


This

It could be
-bearings in the wheels are fucked, causing play in the rear wheel
-bearings are ok, but it is a cheap wheel that needs the cup and cone bearings tightened
- bearings/bushes in suspension pivots are stuffed and need replacing
-bearings/bushes have slogged out in frame and frame is stuffed...

or something completely different. Probably best diagnosed by someone with a clue. These people are sometimes found to be working at bike shops!
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Re: Getting Twisting Flex In My Rear Suspension

Postby foremannz on Mon 10/Jun/13 6:30pm

Thanks guys, I'll take it down to the bike shop and let them advise on whats going on - probably something that needs to be sighted to diagnose.
foremannz
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Member for: 9 years 4 months

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