Restoring a 1983 Trek 720
07-07-22, 08:47 AM
#26
Senior Member
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.
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07-14-22, 04:48 PM
#27
Newbie
Thread Starter
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
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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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07-18-22, 09:00 PM
#32
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07-18-22, 09:02 PM
#33
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07-18-22, 09:14 PM
#34
Senior Member
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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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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