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Calling all well informed monkeys.......

yetihenry

Monkey
Aug 9, 2009
241
1
Whistler, BC
Every one I know of cracked, the uk team ended up racing on different bikes most of the season as they couldn't get replacements quick enough, and noone resigned...
 

Pslide

Turbo Monkey
I'd not seen that before. (At least not as a Zumbi!) I think it's pretty clean looking. From an e-engineering point of view, the leverage ratio is going to be relatively constant rate / not progressive, so it would probably work best with an RC4 with the bottom out maxed. Seems like a reasonable bike, but not exactly state of the art. Didn't see geo numbers anywhere?
 

- seb

Turbo Monkey
Apr 10, 2002
2,924
1
UK
Every one I know of cracked, the uk team ended up racing on different bikes most of the season as they couldn't get replacements quick enough, and noone resigned...
I thought they ended up on replacements because the guy running the team ran off with all of the money and the whole deal fell through?
 

tompug

Chimp
Jul 31, 2010
6
0
I think the team was 4mountains/zumbi, anyway from the pics I found the team ran the f-44, not the team DH. Lets not lets silly things like facts get in the way of our e-speculation :rolleyes:. I will post back if I end up with the frame. It's at a stupidly low price so even if only last a season I wont care.
 

Runner

Monkey
Sep 21, 2007
377
0
CT
If it's built anything like the F44 then it's pretty burly, if it wasn't ridden extremely hard then it should last a while.
 

yetihenry

Monkey
Aug 9, 2009
241
1
Whistler, BC
I thought they ended up on replacements because the guy running the team ran off with all of the money and the whole deal fell through?
Thats why the team eventually collapsed as far as I know, but not why they were on replacement bikes so quick. They were on different bikes way before the **** hit the fan with money.
 

troy

Turbo Monkey
Dec 3, 2008
1,013
750
This frame is POS. Every team dh frame that i have seen had some issues. Cracks after few weeks of riding , misaligned chainstays and so on : | Btw. chainstay is made of 6 separate tubes welded together, because dude has no access to some proper tubing ...
 

illnotsick

Monkey
Jun 3, 2009
257
0
Seems like a terrible spot to put a floating brake. I bet I would smash it on something here within a month of riding.
Do you regularly smash your bottom bracket or the bottom of your swing arm on things? Rocks kick up into it but you don't mash it on stuff, unless you ride like a hack
 

4130biker

PM me about Tantrum Cycles!
May 24, 2007
3,884
450
Please explain why 6 pieces welded together,given what each piece does,regardless of design is not "proper".I'd love to here your vast knowledge of aluminum welding.
Then go look at most swingarms.
Not going to comment on how "proper" this is, but I think he's talking about how the chainstays are made of three small stacked tubes sandwiched together to make what looks like a larger rectangular tube. Maybe the guy had a reason for doing it this way. Maybe the idea was that having the extra "ribs" down the middle helped with twisting along the axis of each chainstay...
I would guess that the guy who made these had access to whatever tubing anyone else can buy.
 

SCARY

Not long enough
Well, it would give it more torsional rigidity than a single piece of tube,aside from being heavier.That swing arm design would be very stressful on the outer welds,anyway.So I would guess this was a solution to a problem rather than "I got no proper tubes".He has access to a cnc machine,he can get tubing.

I think you are right in all of your assessments,though 4130.

Not be'in bitchy,I'm just giving the dude credit for thinking.Whether it worked or not ,I don't know.I just try stuff like this,as far as thinking ,everyday in my business. 98% of people won't even try cuz they don't want to fail.But they can criticize on the interweb all day.
 
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bobsten

Monkey
Oct 23, 2008
240
0
rain rain go away
Well, it would give it more torsional rigidity than a single piece of tube,aside from being heavier.That swing arm design would be very stressful on the outer welds,anyway.So I would guess this was a solution to a problem rather than "I got no proper tubes".He has access to a cnc machine,he can get tubing.

I think you are right in all of your assessments,though 4130.

Not be'in bitchy,I'm just giving the dude credit for thinking.Whether it worked or not ,I don't know.I just try stuff like this,as far as thinking ,everyday in my business. 98% of people won't even try cuz they don't want to fail.But they can criticize on the interweb all day.

No one is going to take you seriously if you edit your posts, tripdik
 

troy

Turbo Monkey
Dec 3, 2008
1,013
750
Please explain why 6 pieces welded together,given what each piece does,regardless of design is not "proper".I'd love to here your vast knowledge of aluminum welding.
Then go look at most swingarms.
Dh-team is 1st Zumbi frame. Those 6 pieces welded together results in much higher weight of the chainstay, it add spots where it can simply fail and add stress to the construction.

I would guess that the guy who made these had access to whatever tubing anyone else can buy.
I'm sorry, but You are wrong. Pawel(zumbi owner) makes those frames in cooperation with Mielec (local company http://www.bikemielec.com/bm_eng/index.html). He is using their tubesets for those frames. Sadly Mielec company makes the most crapy frames in the world. They even have no access to HT after welding (thats why those frames cracks as hell).

There was a lot of fuss about dh-team back in time on local forums. One guy who is working for Boeing (well known person here) right now, gave Mielec a call and they said , that those chainstays are made like that , because they have no other tubes ... So plz stop defending Zumbi , coz Pawel makes huge problems with waranty of those frames. Maybe I (or Norbar if I'll ask him) will translate one of the topics about this frame and zumbis cs ... : |
 

Prettym1k3

Turbo Monkey
Aug 21, 2006
2,864
0
In your pants
Love my F44 Ti. But that bike looks like a Chumba.

Just get an F44. I love mine. I've yet to meet anyone that didn't love the way that theirs rode. It's an awesome bike.