"A Muzi" wrote in message
...
rosco- Can someone confirm that the BB-7400 36x24T is indeed Italian?
Secondly,
what English threaded bottom bracket would folks suggest? BRBR

Qui si parla Campagnolo wrote:
A 7400 in english threading?
Or a UN-72 in 113mm length and english threading.

Maybe, but only because a standard taper crank ( The BB-7400
is 100% interchangeable with Nuovo Record 1046a) will only
go halfway up the taper of a UN-72.

An ACH 115 is a much closer fit. & left arm sits out a bit.

The BB-7400 spindle is asymmetric, so a simple "overall
length" analysis is wanting for accuracy.
--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971


I got a UN52 in 113mm length at a LBS. At the shop, the FC-7400 crank arm
seemed to fit similar to the BB-7400 it came off of (it slid on with hand
pressure about 7/8 of the way down the taper of the crank arm). Installed
the UN52 on the bike, and installed the drive side crank arm (torqued to
about 20-25 ft pd). The crank arm was very much fully on the taper at this
point. The resulting chainline seemed pretty close to spot-on (43.5mm).
The LBS consulted Sutherlands Repair Manual, and concluded that the FC-7400
was JIS and Campagnolo was the next best fit. However, Sutherlands gave no
useful information on how to translate from the BB-7400 to a UN series
cartridge sealed bearing based bottom bracket.