I just picked up a 105 seven-spd. cassette hub. I am currently running a 6-spd freewheel on my bike with a Suntour Sprint 9000 RD, with friction shifters.
The new hub will play nice with the RD, right, so long as the shifters are run in friction mode? The bike was originally spaced for 126, so that shouldn't be an issue.
Is there any chance I'll get the Accushift to work with the cassette hub? I'm guessing no way, jose...
Hi, Oregon Southpaw;
Here are some comments based on my experiences with SunTour shifters. Those were quite nice products, and hold up well.
First, verify that it's actually not a 6-7-Friction shifter. Some of those older SunTours could operate in all three modes, with the mode selected by rotating the bezel ring after loosening the wire bail retainer. Take a close look at the bezel that surrounds the shifter mechanism on the right shifter, and if it has three small figures embossed on it, it may be capable of indexed shifting at both 6 and 7 speeds, as well as friction shifting.
Next, I converted my SunTour 6-index shifter to a 7-index shifter, and used a SunRace 7-speed freewheel in place of the older SunTour 6-speed freewheel. The SunRace had slightly different spacing between the cogs than the SunTour, and my memory is that they vary depending on the cog location. The jump from 20 to 22 to 24 teeth was slightly greater than the other spacing, if my feeble memory is correct. We're talking tenths of a millimeter here, fairly small variances. The SunRace freewheel was Shimano-compatible, with shaped teeth, and took chain well.
BUT, some fiddling with the cable tensioner on the rear derailleur solved most of the problems, and I learned to baby the shift to larger cogs.
To shorten the story; I rode the bike that way for more than a year, must have been about at least 8oo miles, with not much problem.
I say try things out, and let us know what you did and what worked!