My Pino tandem has had some repairs carried out by Chas
Roberts and is going off to be powder coated tomorrow. I've
taken all the gubbins off it for this and have been perusing
the drive train.
The rear chain set looks a bit worn, and needs new rings at
the very least. I'll be replacing the rear chain and, more
than likely, the cassette.
The chain rings are 74mm and 110mm pcd, 26T and 38T
respectively. The chainset is a Dotek YF PR04, whatever that
means. The small chain ring fixes to it using bolts into
tapped holes on the chainset.
It's a 7 speed Sachs Powerglide cassette, run from Sachs
twistgrip shifters.
Questions:
Should I get steel chainrings for longevity? At present the
26T is steel, the 38T aluminium. What super tough yet
amazingly good value aluminium rings are available?
If I can't get a replacement Sachs cassette (they seem
to all be 9 speed) will a 7 speed Shimao fit? The
sprocket spacing is the same, but I'm not sure about the
spline pattern.
Tim