Flattened Oval Top Tube ? 1986 ALAN Record
12-23-21, 06:41 AM
#26
Dirty Heathen
Join Date: Oct 2015
Location: MC-778, 6250 fsw
Posts: 2,192
Bikes: 1997 Cannondale, 1976 Bridgestone, 1998 SoftRide, 1989 Klein, 1989 Black Lightning #0033
Mentioned: 19 Post(s)
Tagged: 0 Thread(s)
Quoted: 889 Post(s)
Liked 928 Times
in
541 Posts
Can’t vouch for the ALANs, but ovalized top tubes (and down tubes) were a feature of Cannondale bikes, starting with the 2.8, 3.0, and continuing through the early CAAD-series.
The main difference is that Dale’s are ovalized horizontally at the seat tube end, and vertically at the head tube; they’re only round in the middle.
The main difference is that Dale’s are ovalized horizontally at the seat tube end, and vertically at the head tube; they’re only round in the middle.
12-23-21, 08:41 PM
#27
Senior Member
Join Date: Mar 2014
Location: City of Angels
Posts: 4,870
Bikes: A few too many
Mentioned: 42 Post(s)
Tagged: 1 Thread(s)
Quoted: 1364 Post(s)
Liked 2,183 Times
in
1,185 Posts
Looks Factory to me......The change in tube appears symmetrical and with the 3 guides, it seems highly unlikely that an over tightened repair stand was used incorrectly because the middle eyelet is not deformed.
JM2c's, Ben
JM2c's, Ben
__________________
"EVERY PERSON IS GUILTY OF ALL THE GOOD THEY DID NOT DO"
Voltaire
Voice recognition may sometimes create odd spelling and grammatical errors
"EVERY PERSON IS GUILTY OF ALL THE GOOD THEY DID NOT DO"
Voltaire
Voice recognition may sometimes create odd spelling and grammatical errors
Likes For xiaoman1:
12-24-21, 08:22 AM
#28
Senior Member
Not sure what the reasoning behind this feature is!
-Robyn
12-24-21, 10:27 AM
#29
Senior Member
Join Date: Mar 2014
Location: City of Angels
Posts: 4,870
Bikes: A few too many
Mentioned: 42 Post(s)
Tagged: 1 Thread(s)
Quoted: 1364 Post(s)
Liked 2,183 Times
in
1,185 Posts
I noticed that my new-to-me 1986 ALAN Record has a slightly flattened oval top tube.
At the front and rear of the bike, where it fits into the seat post lug and head tube lug the top tube is round, and about 1 inch in diameter.
In the middle of the tube the top tube is slightly flattened, and measures about an inch and an eighth wide ( looking down from the top ) and about seven eighths of an inch ( when seen from the side ) at the middle cable guide.
The way the reflected light hits the frame makes the difference obvious. (See picture).
I'm wondering if this is of structural benefit and if it is why isn'y it a more common design feature ?
Bink
At the front and rear of the bike, where it fits into the seat post lug and head tube lug the top tube is round, and about 1 inch in diameter.
In the middle of the tube the top tube is slightly flattened, and measures about an inch and an eighth wide ( looking down from the top ) and about seven eighths of an inch ( when seen from the side ) at the middle cable guide.
The way the reflected light hits the frame makes the difference obvious. (See picture).
I'm wondering if this is of structural benefit and if it is why isn'y it a more common design feature ?
Bink
https://www.bikeforums.net/classic-v...sues-help.html
Best, Ben
__________________
"EVERY PERSON IS GUILTY OF ALL THE GOOD THEY DID NOT DO"
Voltaire
Voice recognition may sometimes create odd spelling and grammatical errors
"EVERY PERSON IS GUILTY OF ALL THE GOOD THEY DID NOT DO"
Voltaire
Voice recognition may sometimes create odd spelling and grammatical errors
Likes For xiaoman1:
12-31-21, 07:00 AM
#30
Death fork? Naaaah!!
FWIW, my Alan is much more stable on fast descents than my round top tubed Vitus 979. Don't know if that's the reason, but it MIGHT make the main triangle less flexy laterally.
Top
Top
__________________
You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)
You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)
Likes For top506:
