1980 Trek 710 bottom bracket?
02-04-25 | 07:30 PM
#3
Senior Member
Joined: Dec 2008
Posts: 2,732
Likes: 2,789
From: Pioneer Valley
Your bottom bracket choice depends on what crankset you’re using.
You’ll at least need to post pictures of the dent to get any opinions on that. Having someone qualified look at it in person is better.
You’ll at least need to post pictures of the dent to get any opinions on that. Having someone qualified look at it in person is better.
02-05-25 | 05:15 PM
#5
Newbie
Joined: May 2008
Posts: 41
Likes: 11
Make it a single front chainring and use a Hollowtech2 68mm BB then just use spacers to figure out your chainline. They still make 9, 10 and 11 speed freewheels. Most likely you would need 2 spacers on your drive side and one on your non-drive side. Super easy clean set up. Set it up with a derailleur hanger if you want more range and a more modern derailleur. I like to use one on each side with the non-drive side hanger as a spacer so the wheel stays even in the dropouts. Just grind the threaded part off and flip it. Is that a dent in the chainstay or is it like that on both sides?
Last edited by coalhills; 02-05-25 at 05:54 PM.
02-05-25 | 08:15 PM
#6
Extraordinary Magnitude
Joined: Aug 2009
Posts: 14,081
Likes: 2,138
From: Waukesha WI
Bikes: 1978 Trek TX700; 1978/79 Trek 736; 1984 Specialized Stumpjumper Sport; 1984 Schwinn Voyageur SP; 1985 Trek 620; 1985 Trek 720; 1986 Trek 400 Elance; 1987 Schwinn High Sierra; 1990 Miyata 1000LT
Are you talking about the dent in the chain stay right behind the bottom bracket? That is there for chainring clearance-
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Commence to jigglin’ huh?!?!
"But hey, always love to hear from opinionated amateurs." -says some guy to Mr. Marshall.
Commence to jigglin’ huh?!?!
"But hey, always love to hear from opinionated amateurs." -says some guy to Mr. Marshall.
