This rock....... - K-Bikes.com - Excellence in Motion
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post #1 of 23 (permalink) Old Jun 1st, 2009, 2:10 pm Thread Starter
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This rock.......

This road:



This rock:



And the fact that I only had 1 hand on the grips and could not swerve quick enough did this:

(Look at about 1 o'clock on the wheel)


And this:

(Look between 8-9)


Which caused a 5 hour wait on an isolated MTN top for this:




And then to get home about a 6 hour 2 up ride on an 09 GT with a guy who is taller but somewhat lighter than I:

(Seeing how I'm 6'4" and weigh about 270 there will be no pics of the2 up ride home)

2008 R 1200 GS ADV
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post #2 of 23 (permalink) Old Jun 1st, 2009, 2:35 pm
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Damn, got both of them. At least you kept the rubber side down.
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post #3 of 23 (permalink) Old Jun 1st, 2009, 4:25 pm
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Both rims. That sucks.

Although, I imagine that it cold easily have looked something like Sharkbait's avatar:


Ken
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'09 Magnesium Beige Metallic K13GT, 60K miles miles and counting...
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post #4 of 23 (permalink) Old Jun 1st, 2009, 5:53 pm
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Thank God you didn't go down, and get hurt. Rims, and tires can be repleced, but a GT rider is valuable.

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post #5 of 23 (permalink) Old Jun 1st, 2009, 6:32 pm
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I'm disappointed you just didn't use the same old rock and beat the rim back into submission and use your portable air compressor all BMW riders are known to carry.


Mack
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post #6 of 23 (permalink) Old Jun 1st, 2009, 6:58 pm
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Quote:
Originally Posted by 2008-K1200GT
Thank God you didn't go down, and get hurt. Rims, and tires can be repleced, but a GT rider is valuable.
New GT $23,000.00, tires and rims $1000.00, BMW Rider Priceless.
Nice to hear you didn't go down.

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post #7 of 23 (permalink) Old Jun 1st, 2009, 7:57 pm
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Yikes!!! A lot of bikers have gone down hitting a lot less... First count your blessings then give your bike a hug and then kick yourself in the ass for not being more attentive! Kidding aside, nice to see you made it through a near disasster.

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post #8 of 23 (permalink) Old Jun 1st, 2009, 8:29 pm
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Just for the hell of it I would suggest you send these photographs directly to BMWNA. Anyone who rides knows a lesser capable bike would have dumped the rider. I bet BMW would like to see how the product performed in an emergency, and you may just get new rims, and tires free of charge.

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post #9 of 23 (permalink) Old Jun 1st, 2009, 9:43 pm
 
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Yikes!!! A lot of bikers have gone down hitting a lot less... First count your blessings then give your bike a hug and then kick yourself in the ass for not being more attentive! Kidding aside, nice to see you made it through a near disasster.
Rebeltown is right. Many riders have gone down for a lot, lot less....either the gods were with you, you were incredibly lucky, or you a outstanding rider...you choose which I am sure a quick change of undies was required after you got it on the centrestand.

There is actually something I am trying to understand here...The damage to the rear wheel is quite some more than the front, yet you must have hit the rock with the front first. The marks to the front suggest a 'glancing strike' which must have nearly wrenched the steering from your 1 hand. Yet it is rear rim that sustained the greatest damage.

Therefore, my question is this:
Why so much more deformation to the rear than the front? Does anyone know if the front rim has a greater tensile strength (harder material) than the rear? The only sensible answer that I can come up with is that since the rear rim has a greater width, the bead is more susceptible to bending stresses, as the support is generated from the rim centreline.

Sorry about this,..it is the Engineer in me that keeps raising its ugly head...

Anyway am glad you are ok, a shitty way to end a ride, but better than coming home feet first.

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post #10 of 23 (permalink) Old Jun 2nd, 2009, 10:07 am
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Quote:
Originally Posted by BigBloke
Therefore, my question is this:
Why so much more deformation to the rear than the front? Does anyone know if the front rim has a greater tensile strength (harder material) than the rear? The only sensible answer that I can come up with is that since the rear rim has a greater width, the bead is more susceptible to bending stresses, as the support is generated from the rim centreline.

Sorry about this,..it is the Engineer in me that keeps raising its ugly head...

Bloke
I believe you are correct. The wider rims are definitely more bendy. Also, the rock seems to have hit that rim almost exactly between two spokes, so I imagine it is particularly weak in that area. The front one looks like it was closer to a spoke.

I know the spoke isn't really supporting the sides, but I would imagine the casting in general is a little beefier where the spokes attach. And they may absorb some of the impact, because it is mostly side-loading. If it hit straight on, the tire and suspension would have absorbed nearly all of it.

I just wonder what would have happened if the wheels were more rigid? Would it have been worse for the rider?
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