Tuesday, October 21, 2008

Legend at 380k cycles

Update 2:
So the test has been down for a bit as i've been busy and haven't had time to pull it out of the machine. Today I got to it and here are the results:
1 mashed finger - i tore it open trying to torque out a axle bolt
1 stripped axle bolt
8 bushings in pretty decent shape and keeping their tolerances
1 NO flexy frame
2 Aluminum axles that again look almost brand new
1 Stainless steel main pivot axle that almost looks like new
1 Al axle i have no idea what it looks like cause i can't get it off right now.





video

So I got alot of questions about the dust on the bolts. Here's a video of whats happening.
Basically the Inside Diameter ID of the Pin is much larger then the OD of the bolt thus its able to slide back and forth and the movement is acting to file down the ID of the pin making the dust.
If i was not such a hack i would have pressed out the bushings and put in ones that fit properly, but since i am a hack thats why there is that movement. Its also the source of the clicking in the video and all the pivots are running smooth and silent... I suppose on the next 300K i'll change out the pin so you can see how quite it can run.

Rest assured that when you get the shock and frame the fit will be proper... This is not a frame specific thing... any frame with suspension could have this issue if you use the wrong fitting spacers/pins so let this be an example to demonstrate the purpose of using proper fitting stuff.

Update:
Ok so the leverage over the shock is very little and the coil we have 400# is for a guy 220+ lbs so its getting worked. At 390K cycles i went downstairs to check it and this is what i found:
Looks like we toasti-ode a 12.9 Gr shock bolt. I'll check the pivots now since i have to change pins and a bolt

5 comments:

Sneeck said...

Lovely, thank's for making the video's. Also very cool that you managed to blow a dhx 5 on just suspension cycles, and how hot it can become.

cheer's!

Aaron said...

I like that fact that you guys are upfront about this stuff, rather than hiding it (like Hammerschmidt's efficiency numbers, lol). Anyway, all I see is a good excuse for some Ti bolts there!!! Ha ha...

Keith Scott said...
This comment has been removed by the author.
illmighty said...

Reminds me of 1st generation Iron Horse Sunday frames in which the lower shock/pivot bolts would shear every now and then (note: it was mainly due to the stock valving on the stock 5th Element shocks). The bolt span on the Sunday was probably double the 22.2mm though.

So, is the dhx being used valved differently on these cycles? Is there a need to valve the rear shock for the leverage rate of the Legend? What do you propose using for shock bolts for those that don't want to replace them every couple weeks?

Thanks for the updates and providing "behind the scenes" building/testing...very cool of you guys!

Jay MacNeil said...

Remember Illmighty that it has gone over 300K which would be a hella lot of riding the bike by a guy probably around 230#s. The bolt was not new either so I can't speak to its previous uses.