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I'm upgrading the cup and cone BB in my super light weight, incredibly
sexy and fast (well compared to all my other bikes anyway) Shogun Tri-
sport 14 speed road bike. The Shimano Exage 300EX cranks, rear
dérailleur and hubs date it to the early 90's I think.
Anyway, I measured the old BB spindle to be 119.87mm, so lets call it
120mm. This was confirmed by info on the late, great Sheldon Brown's
website after I pulled the spindle out and matched the 3N marked on
the spindle to the table on his site: http://sheldonbrown.com/bbsize.html
The LBS didn't know what I was talking about when I said the spindle
was 120mm (I neglected to mention that it wasn't a cartridge BB so
this may have caused them confusion) and offered me 118mm or 122mm
replacements.
In the end I took the spindle in to them, they measured it at 119mm
and recommended a 118mm cartridge replacement which I bought. After
mulling it over for a while, I'm now concerned that the inner ring may
foul on the chainstay (though obviously I'm yet to try it) and there's
the issue of chainline, but I'm going to be out by + or - 2mm either
way depending on if I use a 118mm or a 122mm BB. Apart from
rebuilding the cup and cone BB which I'd rather not do, what should I
do? Is 2mm that big of a deal when it comes to chainline?
sexy and fast (well compared to all my other bikes anyway) Shogun Tri-
sport 14 speed road bike. The Shimano Exage 300EX cranks, rear
dérailleur and hubs date it to the early 90's I think.
Anyway, I measured the old BB spindle to be 119.87mm, so lets call it
120mm. This was confirmed by info on the late, great Sheldon Brown's
website after I pulled the spindle out and matched the 3N marked on
the spindle to the table on his site: http://sheldonbrown.com/bbsize.html
The LBS didn't know what I was talking about when I said the spindle
was 120mm (I neglected to mention that it wasn't a cartridge BB so
this may have caused them confusion) and offered me 118mm or 122mm
replacements.
In the end I took the spindle in to them, they measured it at 119mm
and recommended a 118mm cartridge replacement which I bought. After
mulling it over for a while, I'm now concerned that the inner ring may
foul on the chainstay (though obviously I'm yet to try it) and there's
the issue of chainline, but I'm going to be out by + or - 2mm either
way depending on if I use a 118mm or a 122mm BB. Apart from
rebuilding the cup and cone BB which I'd rather not do, what should I
do? Is 2mm that big of a deal when it comes to chainline?
