Restoring a 1983 Trek 720
07-07-22, 08:47 AM
#26
Senior Member
Originally Posted by 52telecaster
My 1985 720 takes a 6 speed no problem but it came with 5.
There were SunTour "Ultra-6's" for which 6 sprockets were spaced close enough together to fit into the same space as a standard 5-speed. Those can use a 120 mm hub.
From SunTour and others there were 7's with spacing to fit into a 126 mm hub, and some others which were a little too wide and needed 128 mm hub spacing.
So to the OP: measure the spacing between your rear dropouts (inner face to inner face). Most likely it's 126 mm, but it's worth checking. It's nearly 40 years old and could have had a lot of bumps and bruises in that time. It's also worth doing a string test to get an indication of whether the rear triangles are evenly offset.
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07-14-22, 04:48 PM
#27
Newbie
Thread Starter
Originally Posted by Road Fan
There were 6's which have the same distance between sprockets as Regina 5's. Those 6's require 126 mm hubs unless you go with a radical and possibly risky dishing.
There were SunTour "Ultra-6's" for which 6 sprockets were spaced close enough together to fit into the same space as a standard 5-speed. Those can use a 120 mm hub.
From SunTour and others there were 7's with spacing to fit into a 126 mm hub, and some others which were a little too wide and needed 128 mm hub spacing.
So to the OP: measure the spacing between your rear dropouts (inner face to inner face). Most likely it's 126 mm, but it's worth checking. It's nearly 40 years old and could have had a lot of bumps and bruises in that time. It's also worth doing a string test to get an indication of whether the rear triangles are evenly offset.
There were SunTour "Ultra-6's" for which 6 sprockets were spaced close enough together to fit into the same space as a standard 5-speed. Those can use a 120 mm hub.
From SunTour and others there were 7's with spacing to fit into a 126 mm hub, and some others which were a little too wide and needed 128 mm hub spacing.
So to the OP: measure the spacing between your rear dropouts (inner face to inner face). Most likely it's 126 mm, but it's worth checking. It's nearly 40 years old and could have had a lot of bumps and bruises in that time. It's also worth doing a string test to get an indication of whether the rear triangles are evenly offset.
I could buy a new rear wheel built to the correct size, but I don't see how to confidently find a freewheel that would work.
07-14-22, 05:22 PM
#28
Full Member
With 10 posts, you are now free to upload photos!
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72+76 Super Course, 74 P-10+ 79 Tandem Paramounts, 84 Raleigh Alyeska, 84 Voyageur SP, 85 Miyata Sport 10 mixte and a queue
72+76 Super Course, 74 P-10+ 79 Tandem Paramounts, 84 Raleigh Alyeska, 84 Voyageur SP, 85 Miyata Sport 10 mixte and a queue
07-17-22, 10:50 PM
#29
Senior Member
I built mine up as a 9 speed but no matter how you set yours up I think you’ll find it to be a very sweet riding frame. I was surprised how light feeling and responsive it is for a touring frame.
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07-18-22, 06:21 PM
#31
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Originally Posted by pjw77
very nice. Are those 27" rims, or 700c? thanks for the note.
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07-18-22, 09:00 PM
#32
Senior Member
Originally Posted by pjw77
very nice. Are those 27" rims, or 700c? thanks for the note.
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07-18-22, 09:02 PM
#33
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Originally Posted by badger_biker
Thanks. They are 700. I have 28’s on them only because I had them but would like to eventually go with wider tires.
Btw, I wish mine looked as good as yours!
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07-18-22, 09:14 PM
#34
Senior Member
Originally Posted by 52telecaster
Did u have any issues getting the brakes to work?
Btw, I wish mine looked as good as yours!
Btw, I wish mine looked as good as yours!
I had it powder coated so it isn’t fair to compare with an original and I don’t have the nice head tube paint to match the decal like from the factory.
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07-18-22, 10:02 PM
#35
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Originally Posted by badger_biker
They matched up fine with the rims but felt mushy or soft at first. I tweaked the angle of the straddle cable so they grabbed before my levers ran out of play. Pretty good now.
I had it powder coated so it isn’t fair to compare with an original and I don’t have the nice head tube paint to match the decal like from the factory.
I had it powder coated so it isn’t fair to compare with an original and I don’t have the nice head tube paint to match the decal like from the factory.
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