Hey River Dave

[superdave013]

Check out what this kid is making for one of his undergrad projects. Did it all from scratch too. I know your not into bikes but ya gotta love the CNC porn.
I think it's pretty bad ass.
http://gallery.consumerreview.com/webcrossing/images/LeftSideviewFull.jpg
The solid model
http://gallery.consumerreview.com/webcrossing/images/zedrodesignprogress7.jpg

[Dr. Eagle]

Originally posted by RiverDave
I'm pretty sure his Dad owns a machine shop or something.. ;) :D
Seriously though, that's kind of an odd way to do the suspension on the bike isn't it?? I'm wondering if that thin rod going to the back is going to be strong enough to support the weight of the rider???
Definately a bad ass machining job though. :)
RD
That is pretty hella cool ALBIET unusual. I think that rod is a tension member...am I right? To stop the forward travel??? or to counterbalance the spring/shock??? I guess I mean the upward force of the spring and shock...crap... I really don't get how that thing works...
:confused:

[HOSS]

Looks to be as useless as human waste!

[Kilrtoy]

ok what will they think ok next

[Dr. Eagle]

I don't know if it is human waste, but a lot of wasted effort...in my book anyway...

[superdave013]

If the rod you are talking about is the one that goes from the seat mast to the rear wheel. That is really going to the brake caliper mount. That keeps braking forces separate from the suspension. In a nut shell when you get on the rear brake it will not stiffen up the rear end.
The funky chain set up makes the chain line not grow when the suspension goes up and down. It also stops and pedal induced suspension movement and pedal kick back from the rear end. You don't notice it to bad on a normal bike with 2-3" of wheel travel but on a long travel deal it's big time noticable.
He says this one will get 11" of wheel travel.
And no Dave, he didn't do it at his dad's shop. Did it all in school on their 5 axis CNC set up. lol, he said they cut him off and that's why it's not done yet.

[superdave013]

Originally posted by Dr. Eagle
I don't know if it is human waste, but a lot of wasted effort...in my book anyway...
It's all in what you're into I guess. That guy would think the same thing about your boat.
Look at how much effort goes into a race car or a race boat. Why? Just to be a little faster then the next guy. Same applies here. Better, more efficent supension mean he could go faster through the nasty stuff then the next guy. Cost? Who cares, it's racing and if you wanna play then money don't matter. That goes for anything you race if you want to win. RC cars to NASCAR.
These bikes are allot of fun. Just remember when your on your way to work your boat is sitting in your garage. Hell, I rode a 4,500 down hill race bike to work today. Why? because it's fun (and I like to jump this HUGE double stair gap on the way home) :D

[superdave013]

Originally posted by RiverDave
They cut him off using a school machine?? Wassup with that? :(
Did he crash the machine or something?
RD
I think he's project was taking just a tad more time then was allowed. I wonder what the other kids were making.

[hack job]

very intresting! i like it will it make it easier for me to ride up hill:p

[Dr. Eagle]

Originally posted by RiverDave
Well I can say that if I was die hard in to mountain biking I wouldn't think it's a waste of energy.. I'm not into mountain biking and I think it's pretty bad ass myself....
Then again I got this "billet" fetish so pretty much anything that's cool n billet I think is bad ass.
RD
My son is into Mountain Biking hardcore. I am going to show him this picture and plan.
It kind of looks like engineering for the sake of engineering to me, and being that it is an undergrad project, it probably is. And, of course there is nothing wrong with that at all.
And with that much travel, it might be a pretty forgiving bike to ride on a trail. I wonder how many innovations like this came from college projects or theses?
I am with you too RD...BILLET = :cool:
Just kind of have to wonder how durable it would be in heavy use...
:confused:

[superdave013]

Dr. You don't ride that on trails. It's not a trail bike. It's for downhill racing only. It will only have 8 gears and would not go up hill very well. We go to the ski resorts and take the chairlift up. Or now that the season is over we do allot of truck shuttling.
I to would like to see how well it holds up. But others kinda like it seem to do pretty well.

[Dr. Eagle]

Originally posted by superdave013
Dr. You don't ride that on trails. It's not a trail bike. It's for downhill racing only. It will only have 8 gears and would not go up hill very well. We go to the ski resorts and take the chairlift up. Or now that the season is over we do allot of truck shuttling.
I to would like to see how well it holds up. But others kinda like it seem to do pretty well.
Aha!
My son had talked about building his bike for downhill on ski runs in the summer before he went in the Army...
I can see the need for the huge travel at the Kamikaze speeds they run downhill...it all makes sense now...
It kinda seemed like it would be like riding a wet noodle on a trail, maybe not, hell, I don't know...and I gotcha the gearing is tall for the insane downhill speeds.

[superdave013]

Hey Dr Eagle, I see you're in N CAL. Does your son ride at North Star? I love that place. Steep and ROCKY. Oh, did I say it's rocky?
I need a fix.
Hack job, lets hit PV saturday!
Here's my trail / freeride bike. Supa stout and won't break. 7" of travel front and rear and still climbs ok. Kinda heavy though in the high 30's. It has all the bad traits that that kid is trying to solve.
http://www.hotboatpics.com/pics/data/500/1503bullitdh.jpg
My Downhill rig. You don't even want to think about riding up hill on that. But on the way down it's 8" front / 9" rear wheel travel and 51 pounds of pure bliss. A guy in New York that goes by Frank The Welder made it for me. Pic was taken in Alpine when we were poaching Indian land. That area is all burnt now. :(
http://www.hotboatpics.com/pics/data/500/1503anderson_dh.jpg
Hack Job, did I tell you I need a fix? Lets hit PV man. :) There's a cool step up jump there that I wanna show ya. :D

[hack job]

dave have you rode rose hills?
i went and looked it over this weekend( no bike) and it looked like there were several places to hit up i couldnt get too in to the place due to no bike lol.
i will say that i was going to hit up the races on sat . what are you doin on sun?
i have a question what can be done about this thing?
http://www.***boat.com/image_center/data/520/36Dscn2432-med.jpg
its a piece of crap ! i have it maxed out on preload and it still sags a bit;)
ill talk with chirs and maybe we can get mark ( wrightnow) in on this he rides too.

[Dr. Eagle]

He wanted to go to Northstar. I have been up there during the summer when I was workign for AT&T Wireless because they have a site right at the top of the run. I saw the guys taking their bikes up on the chair lift riding down the ski run...
My son never did build the donwhill bike, he had a really nice GT aluminum frame full suspension bike...but he wanted to build a bike like yours for the downhill. He did go to Borreal I think once with this GT bike, but He never built the dedicated kamikaze downhill racer bike before going to basic training. His GT bike got stolen in Korea, and now he only has his road bike.
He is trying to get another, but he is a dad now and has some other obligations to worry about. He lives in Las Vegas now and works at the Test Site. He said there are some good places to ride on the north side near Mt. Charleston.
He is trying to get something just to get out there riding again, I think he amost has his wife sold on it. I bought the last three bikes so I have made my contribution for him, he is on his own for this one.

[superdave013]

Originally posted by Dr. Eagle
Aha!
My son had talked about building his bike for downhill on ski runs in the summer before he went in the Army...
I can see the need for the huge travel at the Kamikaze speeds they run downhill...it all makes sense now...
It kinda seemed like it would be like riding a wet noodle on a trail, maybe not, hell, I don't know...and I gotcha the gearing is tall for the insane downhill speeds.
Coverting a trail / cross country bike for downhill is not the way to go. The geometry is so different. These have a real slack head tube kinda like a chopper in a way. Makes it more stable at speed and mostly it make is much better when it's so steep your ass is touching the rear tire. Plus they are much more heavy duty.
The thing with the gearing is that it's limmited. You can set up up for high or low but you won't get the gear ratio spread like you would on your son's bike. He has 3 chain rings on the front and we only have one. We put bash guards and chain guides in place of the other 2 chain rings. If you didn't run a guide your chain would fall off every run.
I make my own guides. Here's a pic of my latest one.
And yes, that bike would be pretty squishy on a trail ride.
http://www.hotboatpics.com/pics/data/500/1503X_overall.jpg

[Dr. Eagle]

Yeah, I understand what you are saying. But this was about 6+ years ago before he went into the Army. He was managing a Round Table Pizza and didn't make all that much money so he didn't have a whole lotta cash to do much with the bikes.
Your bike looks mean...beefy...stout...like it is designed to take some punsihment.

[superdave013]

Tyson, all you can do is put a heavier spring on it.
I'm going to the races on sunday with MikeF. He has to work on sat.
I've never been that place before. But I'm always up for new dirt. I have not been riding much at all lately. I forced myself to ride to work today.
Dr. Sorry to here he got his steed pinched. That top bike of mine I posted is a Santa Cruze Bullit. He might try to pick up a used one. Could be built up kinda light but he won't win a crosscountry race on it. But they are good trail bikes and work pretty damn well on downhill stuff too. If I would have gotten it first it would be the only bike I'ed have. I do have a light weight cross country bike too. I never ride it anymore. Downhilling is to much fun.

[flat broke]

Hacker,
Ask Dave realy nice if he will let you use his lathe to turn down some barstock to replace that cheeseball shock. Make the F'er a hard tail for now and forget about the annoying bob that undampened POS has. :) Besides, then you'll have one less excuse not to ride. It's either that or buy something like a Fox with a lockout and cut it all up along with your frame to frankenstein it together.
Dave,
As far as riding, I gotta call Ty and find out which day we are going to the races. If you're going Sunday maybe we'll go Sunday as well and meet you up there which would leave Saturday open for ridding. I opted to come home sick today in hopes of getting some rest to get over whatever nasty disease Em brought home from the little germ farms at work. With any luck I'll be good to go by Thursday.
Chris

[hack job]

dave ill see what i can rig up . anther spring or some thing. ill have to go shopping on my fav place! ( ebay);) :D if i cant find any thing ill let you all know

[superdave013]

Originally posted by hack job
dave ill see what i can rig up . anther spring or some thing. ill have to go shopping on my fav place! ( ebay);) :D if i cant find any thing ill let you all know
Tell me how long it is (off the shock) and the ID and OD of it. And it should say what weight it is. Prolly a 350# or so. I'll post on some of the bike message boards and see if one of the bike shop rats can come up with a good used one.

[Goodtime$]

superdave, i used to ride a lot of downhill until i got smart and bought a new dirtbike for the price of my DH sled.
my only tip would be to make the linkage and pivot points more simple, remember Steve Peat is winning on a single pivot DH bike.
The intense/specialized link is good.
best of luck

[superdave013]

Originally posted by Goodtime$
superdave, i used to ride a lot of downhill until i got smart and bought a new dirtbike for the price of my DH sled.
my only tip would be to make the linkage and pivot points more simple, remember Steve Peat is winning on a single pivot DH bike.
The intense/specialized link is good.
best of luck
Note the single pivot that's on my bike. I have an Intense Tracer as my XC bike. Thought about an M1 but Frank hooked me up with this. My inlaws live in Big Bear so that's how I tell myself that the DH is worth it.
It's a bitch when you think about a new Intense M1 costs more then a new 250.
Oh, Pete could win on a Huffy! That snaggle tooth is fast!
Did you ever ride the Anderson World Cup down in Alpine?

[hack job]

Originally posted by superdave013
Tell me how long it is (off the shock) and the ID and OD of it. And it should say what weight it is. Prolly a 350# or so. I'll post on some of the bike message boards and see if one of the bike shop rats can come up with a good used one.
i have this damn ting out and it a piece of crap that is its problem i looked around last night on google and found nothing its made by a company called shock works . it model # is c371-f200
then there is E07 8C31 the spring has the # F200 on it . iam guessing a 200# or so. the rear stub measures 1 1/8 "and the total lenght of the shock is 7.5" form the eyelet to the center of the stub on the bottom is 6"
i was thinking about a fox float to replace it and rig . it with some type of post that will bolt through the eyelet on the new shock it cant have a resivor on it cause there is very little room.
any how here are some pics of it
http://www.***boat.com/image_center/data/520/36DSCN2463-med.JPG
http://www.***boat.com/image_center/data/520/36DSCN2464-med.JPG
http://www.***boat.com/image_center/data/520/36DSCN2465-med.JPG
hope this helps. remeber my bike isnt the best so the i dont really want to spend more than 50 bucks on the shock for it. i can get the fox float for about that on ebay.:confused: what do you think?

[Larry Nebb]

wtf is all this bike shit????????

[flat broke]

Well, this is the SANDBAR forum, and it does happen to be the place desinated for non boating topics. A quick look around would clue ya in to the fact that there isn't much on this board that IS boating related. So I guess Bikes would be just as appropriate as say "complete the story", "traffic question", or "back trouble".
Now on to important stuff.
Hacker,
Whats up with those ghetto tape measure pics? Did you lose your fancy ass digital display calipers? :D As long as you can find a replacement shock that is about an inch shorter than your current deal measures from the tip of the rear triangle to the eye of the shock where it meets the front triangle, we should be able to do up a slick little yoke for ya. I think the older float shocks are a little shorter than the Vanillas so if you aren't affraid to go air, you might be able to find something that would fit. Otherise, find a decent vanilla with a tripple extra heavy duty spring, so that I can ride your jerry rigged hoopty. ;)
Chris

[superdave013]

Well I'm not the biggest fan of Fox Shocks but their air shocks are pretty good. The floats came in different lenghts for different frames. Some have lock outs and some don't. My XC bike has one with a lock out and guess what?? I never used it anyway.
If you could pick one up for 50 bones that's a good deal. They are pretty $$$ new. I just happen to have an extra pump for them I'm pretty sure. More air = bigger spring. Has a rebound adjuster too.
I bet a 350 pound spring would do the trick on the one you have.
If you want you can ride my DH bike at PV. You will love it untill ya get to the bottom. But hey, what's the difference between pushing that one up the hill or the one you have now?
I'm going for sure on Saturday.

[superdave013]

Hacker,
Am I missing something or does this shock only have an eye on one end?
http://www.***boat.com/image_center/data/520/36DSCN2463-med.JPG

[flat broke]

Thats the oddity of Hackers Ride, The round stock side of the shock is held into the rear triangle like a stem around a threadless fork. Crazy schiznit, and KHS didn't use that setup for very long. I was just going to machine a piece that dropped into the rear triangle and had a yoke to drop the eye of another shock into. Luckily the rebound forces are nothing like the compression forces, so the thing tends to hold together if for no other reason, just due to the weight of the rider keeping everything compressed.
I found rears all over ebay below $50, so he should be able to find something to get that thing workin. What time are you going to be at Del Cerro on Saturday?
Talk to you later,
Chris

[hack job]

ok let us know what time and were and ill see what i can do . i think ill stick with my bike though due to the fact i would feel more comfortable on it. nothing against your bike dave. lol