Chainline and pedal alignment for old Cannondale

sent out a PARTS CHALLENGE to Universal Cycles for the AA but only local noise so far saying NA, unoffalicial...

Andre Jute wrote:
Bob, you're pushing yourself deeper and deeper into the quicksand. These guys are used to fitting bottom brackets to bikes that use standard components, either 110 or 113mm. If the bike isn't standard, the rule of thumb doesn't run. Here, again, is the decision tree which delivers the correct answer.

[big snip]

On this bike, the tightest constraints are to clear the chainstays and keep
the chain within reach of the front derailer. Aft of that the chain more or
less takes care of itself using the existing rear derailer.

After a bit(!) of measuring, it looks as if the most nearly correct spindle
for the existing crankset is a size 3K from the table on the Sheldon Brown
website: http://sheldonbrown.com/bbsize.html
The drive side is 33.5 mm long, non drive is 32, overall length 117.5 mm..

Unfortunately, the page also notes that the parts are hard to find, borne
out by a web search. Everybody seems to be using cartridges.

Is there a simple correspondence between bottom bracket cartridge
"size" and the overall length in the Sheldon Brown table? Is it
possible to reverse cartridge bottom brackets left-to-right to exploit
asymmetry relative to centerline??

Thanks for reading,

bob prohaska

On Saturday, November 30, 2013 2:58:49 AM UTC, User Bp wrote:
Andre Jute wrote:

Bob, you're pushing yourself deeper and deeper into the quicksand. These guys are used to fitting bottom brackets to bikes that use standard components, either 110 or 113mm. If the bike isn't standard, the rule of thumb doesn't run. Here, again, is the decision tree which delivers the correct answer.



[big snip]



On this bike, the tightest constraints are to clear the chainstays and keep

the chain within reach of the front derailer. Aft of that the chain more or

less takes care of itself using the existing rear derailer.



After a bit(!) of measuring, it looks as if the most nearly correct spindle

for the existing crankset is a size 3K from the table on the Sheldon Brown

website: http://sheldonbrown.com/bbsize.html

The drive side is 33.5 mm long, non drive is 32, overall length 117.5 mm...



Unfortunately, the page also notes that the parts are hard to find, borne

out by a web search. Everybody seems to be using cartridges.



Is there a simple correspondence between bottom bracket cartridge

"size" and the overall length in the Sheldon Brown table? Is it

possible to reverse cartridge bottom brackets left-to-right to exploit

asymmetry relative to centerline??



Thanks for reading,



bob prohaska

Cartridge bottom brackets are handed. If you turn them over, they'll spin themselves loose by precession.

Andre Jute

Andre Jute wrote:

Cartridge bottom brackets are handed. If you turn them over, they'll spin themselves loose by precession.


Ok, thanks for the warning!

bob prohaska

User Bp wrote:
:Andre Jute wrote:
: Bob, you're pushing yourself deeper and deeper into the quicksand. These guys are used to fitting bottom brackets to bikes that use standard components, either 110 or 113mm. If the bike isn't standard, the rule of thumb doesn't run. Here, again, is the decision tree which delivers the correct answer.
:
:[big snip]

:On this bike, the tightest constraints are to clear the chainstays and keep
:the chain within reach of the front derailer. Aft of that the chain more or
:less takes care of itself using the existing rear derailer.

:After a bit(!) of measuring, it looks as if the most nearly correct spindle
:for the existing crankset is a size 3K from the table on the Sheldon Brown
:website: http://sheldonbrown.com/bbsize.html
:The drive side is 33.5 mm long, non drive is 32, overall length 117.5 mm..

:Unfortunately, the page also notes that the parts are hard to find, borne
ut by a web search. Everybody seems to be using cartridges.

:Is there a simple correspondence between bottom bracket cartridge
:"size" and the overall length in the Sheldon Brown table? Is it
ossible to reverse cartridge bottom brackets left-to-right to exploit
:asymmetry relative to centerline??

There are very few (if any at all) asymetric cartidge bottom brackets.
Sheldon's chart gives the symmetric equivalent. Get that, or the
nearest size over. Install. Ride bike.

--
sig 38

On Friday, November 29, 2013 9:58:49 PM UTC-5, User Bp wrote:
Andre Jute wrote:

Bob, you're pushing yourself deeper and deeper into the quicksand. These guys are used to fitting bottom brackets to bikes that use standard components, either 110 or 113mm. If the bike isn't standard, the rule of thumb doesn't run. Here, again, is the decision tree which delivers the correct answer.



[big snip]



On this bike, the tightest constraints are to clear the chainstays and keep

the chain within reach of the front derailer. Aft of that the chain more or

less takes care of itself using the existing rear derailer.



After a bit(!) of measuring, it looks as if the most nearly correct spindle

for the existing crankset is a size 3K from the table on the Sheldon Brown

website: http://sheldonbrown.com/bbsize.html

The drive side is 33.5 mm long, non drive is 32, overall length 117.5 mm...



Unfortunately, the page also notes that the parts are hard to find, borne

out by a web search. Everybody seems to be using cartridges.



Is there a simple correspondence between bottom bracket cartridge

"size" and the overall length in the Sheldon Brown table? Is it

possible to reverse cartridge bottom brackets left-to-right to exploit

asymmetry relative to centerline??



Thanks for reading,



bob prohaska
..............


if you can't follow the directions, email universal cycles fo a kit.

On 30/11/2013 03:34, Andre Jute wrote:
On Saturday, November 30, 2013 2:58:49 AM UTC, User Bp wrote:

Is there a simple correspondence between bottom bracket cartridge

"size" and the overall length in the Sheldon Brown table? Is it

possible to reverse cartridge bottom brackets left-to-right to exploit

asymmetry relative to centerline??


Cartridge bottom brackets are handed. If you turn them over, they'll spin themselves loose by precession.

More importantly, they won't even screw in.

On Sat, 30 Nov 2013 02:58:49 +0000 (UTC), User Bp
wrote:

Andre Jute wrote:
Bob, you're pushing yourself deeper and deeper into the quicksand. These guys are used to fitting bottom brackets to bikes that use standard components, either 110 or 113mm. If the bike isn't standard, the rule of thumb doesn't run. Here, again, is the decision tree which delivers the correct answer.

[big snip]

On this bike, the tightest constraints are to clear the chainstays and keep
the chain within reach of the front derailer. Aft of that the chain more or
less takes care of itself using the existing rear derailer.

After a bit(!) of measuring, it looks as if the most nearly correct spindle
for the existing crankset is a size 3K from the table on the Sheldon Brown
website: http://sheldonbrown.com/bbsize.html
The drive side is 33.5 mm long, non drive is 32, overall length 117.5 mm..

Unfortunately, the page also notes that the parts are hard to find, borne
out by a web search. Everybody seems to be using cartridges.

Is there a simple correspondence between bottom bracket cartridge
"size" and the overall length in the Sheldon Brown table? Is it
possible to reverse cartridge bottom brackets left-to-right to exploit
asymmetry relative to centerline??

Thanks for reading,

bob prohaska

Bottom bracket "brackets"? You mean the cups? If so you can't switch
them. One is R.H. thread the other L.H.
--
Cheers,

John B.

On Sat, 30 Nov 2013 04:22:36 +0000 (UTC), David Scheidt
wrote:

User Bp wrote:
:Andre Jute wrote:
: Bob, you're pushing yourself deeper and deeper into the quicksand. These guys are used to fitting bottom brackets to bikes that use standard components, either 110 or 113mm. If the bike isn't standard, the rule of thumb doesn't run. Here, again, is the decision tree which delivers the correct answer.
:
:[big snip]

:On this bike, the tightest constraints are to clear the chainstays and keep
:the chain within reach of the front derailer. Aft of that the chain more or
:less takes care of itself using the existing rear derailer.

:After a bit(!) of measuring, it looks as if the most nearly correct spindle
:for the existing crankset is a size 3K from the table on the Sheldon Brown
:website: http://sheldonbrown.com/bbsize.html
:The drive side is 33.5 mm long, non drive is 32, overall length 117.5 mm..

:Unfortunately, the page also notes that the parts are hard to find, borne
ut by a web search. Everybody seems to be using cartridges.

:Is there a simple correspondence between bottom bracket cartridge
:"size" and the overall length in the Sheldon Brown table? Is it
ossible to reverse cartridge bottom brackets left-to-right to exploit
:asymmetry relative to centerline??

There are very few (if any at all) asymetric cartidge bottom brackets.
Sheldon's chart gives the symmetric equivalent. Get that, or the
nearest size over. Install. Ride bike.

And they only go in one way :-)
--
Cheers,

John B.

On Fri, 29 Nov 2013 19:34:55 -0800, Andre Jute wrote:

snip

Is there a simple correspondence between bottom bracket cartridge

"size" and the overall length in the Sheldon Brown table? Is it

possible to reverse cartridge bottom brackets left-to-right to exploit

asymmetry relative to centerline??

Cartridge bottom brackets are handed. If you turn them over, they'll
spin themselves loose by precession.

Only if you can screw a left hand thread into a right hand thread and
vice versa I would have thought.

They do come with spacers for a wee bit of adjustment.
--
davethedave