Odd (?) frame dimensions
07-15-23, 02:27 PM
#1
Senior Member
Thread Starter
Odd (?) frame dimensions
I have a mystery frame that I built into a bike; pics here:
https://www.bikeforums.net/classic-v...ike-frame.html
The reason I'm also posting in this sub-forum is to ask if these numbers (all c-c) are peculiar:
Seat-tube 50cm
Top-tube 54cm
Chainstay 42cm - crank to axle
Seatlug says 75, can't see an angle on the head lugs.
Wheelbase is 99cm but the fork isn't original.
https://www.bikeforums.net/classic-v...ike-frame.html
The reason I'm also posting in this sub-forum is to ask if these numbers (all c-c) are peculiar:
Seat-tube 50cm
Top-tube 54cm
Chainstay 42cm - crank to axle
Seatlug says 75, can't see an angle on the head lugs.
Wheelbase is 99cm but the fork isn't original.
07-15-23, 05:02 PM
#2
Randomhead
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Posts: 24,872
Liked 4,042 Times
in
2,753 Posts
I don't think it's a Austro-Daimler, but their dimensions were a little out of whack like that.
07-17-23, 07:52 AM
#3
Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,341
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
Liked 4,188 Times
in
2,471 Posts
I don't think these numbers are so far off base from common small sized sporting bikes. Seat tube/top tube is "over square", a large frame would be "under square" usually. That "75" on the seat lug doesn't mean the seat tube angle is actually 75*, just that it is what the lug was made for. Stamped sheet metal lugs can tolerate a couple of degrees of fit from the OEM angle. So this frame could have a 74 seat angle which on a small frame is quite typical. Chainstay length is pretty common and so is the wheelbase.
This frame is close to what I might ride. Andy
This frame is close to what I might ride. Andy
__________________
AndrewRStewart
AndrewRStewart
