Joined: Aug 2009
Posts: 7,724
Likes: 4,183
From: Berkeley, CA
Bikes: 72 Cilo Pacer, 72 Gitane GT, 72 Peugeot PX10, 73 Speedwell Ti,l, 75 Peugeot PR-10L, 80 Colnago Super, 81 Zinn, 85 ALAN Cross, 85 De Rosa Pro, 86 Look 753, 86 Look KG86, 89 Parkpre Team, 90 Parkpre Team MTB, 90 Merlin
The fixed cup should be right-threaded if it's French and left-threaded if it's Swiss. It sounds like no BB is installed now. Can't you simply put your fingernail in the BB grooves and see which way you need to rotate to tighten, or even eye-ball the direction of the threads? Less risk of cross-threading if the cup is not the right threading. We can probably rule out Italian threading & ISO/English threading. If it's French, maybe consider a dual-adjustable cup setup to fine tune the chainline?
__________________
-Randy
'72 Cilo Pacer (x2) • '72 Peugeot PX10 • ‘72 Gitane Gran Tourisme • '73 Speedwell Ti • '74 Motobecane Grand Jubile • '74 Peugeot UE-8 • ‘80 Colnago Super • ‘81 Univega Super Special • ‘82 Zinn • ‘84ish Mystery Custom • '85 A.L.A.N Cyclocross • '85 De Rosa Pro • '86 Look Equipe 753 • '86 Look KG86 • '89 Parkpre Team Road • '90 Parkpre Team MTB • '90 Merlin Ti
Avatar photo courtesy of jeffveloart.com, contact: contact: jeffnil8 (at) gmail.com.