Originally Posted by highandlowrpm

I highly recommend the white industries dos eno dual freewheel, for on the road manual gearing changes. You do have to convert from track 1/8” to 3/32” chainring and chain, but it’s great. I have the 17/19 and 20/22 tooth combos. Important to size the chain just right, so it will cover either rear wheel cog in the dropout space available. And locate the rear rim brake pads vertically just right for both cogs. With a 50t upfront and 17/19, I have either 79 or 70 gear inches available on my ride.

For a recent 50 mile club ride, used 47x17 for the first 20 mile flattish section, and swapped over to the 47x19 at a regroup for the next 20 mile hilly section, but eventually got dropped by the group. Can only go so far keeping up with the geared up, fully kitted and aero bunch :/ Save the 42t up front, for the mountains and major hill climbs.