"Fairly large" frame, who built it??
#1
Senior Member
Thread Starter
Join Date: Mar 2012
Location: santa barbara CA
Posts: 1,087
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 96 Post(s)
Liked 30 Times
in
21 Posts
"Fairly large" frame, who built it??
Yao Ming, ex-NBA all pro, 7'6", 340(+-). Nice looking design, anyone know who built it? I know the photo angle accentuates the size/scle, but nevertheless that is a big bike!
thanks, Brian
https://i.imgur.com/6FP9d.jpg
thanks, Brian
https://i.imgur.com/6FP9d.jpg
Last edited by calstar; 04-29-12 at 12:38 PM.
#2
Still spinnin'.....
Join Date: May 2009
Location: Whitestown, IN
Posts: 1,208
Bikes: Fisher Opie freeride/urban assault MTB, Redline Monocog 29er MTB, Serrota T-Max Commuter, Klein Rascal SS, Salsa Campion Road bike, Pake Rum Runner FG/SS Road bike, Cannondale Synapse Road bike, Santana Arriva Road Tandem, and others....
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
Last edited by Stealthammer; 04-29-12 at 01:11 PM.
#3
Still spinnin'.....
Join Date: May 2009
Location: Whitestown, IN
Posts: 1,208
Bikes: Fisher Opie freeride/urban assault MTB, Redline Monocog 29er MTB, Serrota T-Max Commuter, Klein Rascal SS, Salsa Campion Road bike, Pake Rum Runner FG/SS Road bike, Cannondale Synapse Road bike, Santana Arriva Road Tandem, and others....
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
#4
Decrepit Member
It's a custom built Gunnar Rockhound MTB frame with 29" wheels built with True Temper OX. The fork was made by Vicious Cycles.
#5
Framebuilder
Join Date: Dec 2007
Posts: 570
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Yao must really like to do wheelies.
#6
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,387
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,687 Times
in
2,510 Posts
the Waltworks rant about this bike was a good read
#7
Senior Member
Thread Starter
Join Date: Mar 2012
Location: santa barbara CA
Posts: 1,087
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 96 Post(s)
Liked 30 Times
in
21 Posts
the Waltworks rant about this bike was a good read
Brian
#8
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,387
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,687 Times
in
2,510 Posts
it's certainly worth discussing. I wonder if he ever used it much
#9
Decrepit Member
All I got out of Walt's rant is that he'd have done it differently and some of the reasons he would have done so. There's more than one way to skin a cat.
#10
Senior Member
Yeah hard to tell how it would actually ride by looking at a picture. On the road it's probably okay. But those chaintays do look quite short, and I don't get what the crossed top tubes try to achieve.
#11
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,387
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,687 Times
in
2,510 Posts
I think they had to do something to keep that huge front triangle from racking. The crossed top tubes might not have been the best thing, but it does reduce the bending moment on the head tube. As Walt notes, the steerer could be a problem anyway.
I do think the chainstays are too short, maybe not 200mm short though. I hate climbing hills enough without doing wheelies. That bike has to be a wheelie machine.
I do think the chainstays are too short, maybe not 200mm short though. I hate climbing hills enough without doing wheelies. That bike has to be a wheelie machine.
#12
Decrepit Member
It would be interesting to know what input Yao Ming and/or the Gunnar dealer fitting him had into the design. I know from personal experience that Waterford typically solicits lots of customer input when designing custom frames; their stock geometry charts are fairly conventional.
#14
Senior Member
Join Date: Jul 2011
Posts: 2,441
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 33 Post(s)
Likes: 0
Liked 4 Times
in
3 Posts
The rear end geometry is odd, unless there is something in particular we don't know about. I am also anti set-back seat posts, though they have their place. A 2.5 inch tube would be 8 times stiffer, and the dude isn't even that heavy. I was near that at one point when I toured without difficulty on 1.125 downtube, the old oversize.
#15
Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,056
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4195 Post(s)
Liked 3,837 Times
in
2,295 Posts
The rear end geometry is odd, unless there is something in particular we don't know about. I am also anti set-back seat posts, though they have their place. A 2.5 inch tube would be 8 times stiffer, and the dude isn't even that heavy. I was near that at one point when I toured without difficulty on 1.125 downtube, the old oversize.
One of the issues with very tall/long bikes is that the leverage is so much greater. A tall skinny guy flexes a bike more then a small stocky guy.
Here's a shot of a 70+ cm frame I built back in 1985. It took a lot to get my boss to use my suggestions of a straight gauge thick wall down tube and a custom machined steerer, also of thicker wall then usual. These days i'd go about this completely different. Andy.
#16
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,387
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,687 Times
in
2,510 Posts
I guess if you count Huffys, they had 1" downtubes. But the standard size DT is 1 1/8", just ask Klein, he patented bigger tubes after getting the idea from one of his professors. My tandem was the first bike I ever built with OS tubing, the DT on that is 1 1/4 using Reynolds 531 tandem tubing that was available back in the early '80s.
#17
Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,056
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4195 Post(s)
Liked 3,837 Times
in
2,295 Posts
Most of the USA production used 1" main frame tubes at one time. Schwinn, Columbia, Murray, Huffy, Ross to name the biggies. Granted most of their bikes were targeting the recreational rider. Cruisers, kids bikes and 3-speeds. But each company had a "lightweight" line with 10 gears too that used the same frame tubes. But then the old guys already knew this. Andy.
#18
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,387
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked 3,687 Times
in
2,510 Posts
I'm old. I guess I always considered the bikes with 1" downtubes to be bike-like-objects since even the cheapest bikes worth owning were built with what is now called "standard" size tubing.
#19
Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,056
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4195 Post(s)
Liked 3,837 Times
in
2,295 Posts
Eric- My post is part of my never ending attempt to base discussions with the history of how things are done at that time and how things evolve but then the old is forgotten. In enough time the current design standards (OS and XLOS tubes, sloping top tubes, ect) will be also forgotten. Until some stick in the mud guy, like me, mentions that people used to think the new bikes that were able to coast were an unfair advantage... Smiles, Andy.
#21
Decrepit Member
#22
Senior Member
Regarding the Gunnar. I figured they wanted to strengthen the large front triangle with the crossed top tubes, but it seems they are weakening it? Having those tubes land in the middle of the unsupported seat and head tubes would increase the bending moment? (plus the seat tube is smaller dia then the tubes mitred to it, can't be good) The crossing does create smaller triangles, but not were it's needed I'd say.
Talking of smaller DTs. I'm working on a 1937 CCM... it has a 1-1/16 DT and ST. Serious wtf moment...
Talking of smaller DTs. I'm working on a 1937 CCM... it has a 1-1/16 DT and ST. Serious wtf moment...