It’s an illness

Steve hop… ST wheel also has a slightly wider rim.
They are interchangeable with nothing else required.
ST 19” rim is best as a pure road bike, but I preferred the G/S 21” rim as my ST is more g/s than st now, and I wanted the 21 rim.
Centres, and brake disks exactly same g/s or st.

Hope this helps.

Ok thanks for the info.
I have 2 G/S bikes a 82 and an 86 the rear wheels look exactly the same but , they are both part number 12427941 -- 18" 2.50-B-DOT-SPAIN , but the last series of digits are different ? Both measure the same size rim widths ?
 
Rears for g/s and st are the same I believe….. my earlier comments were about front wheel
 


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