Chainring Conversion For Shimano Nexus 7 Internal geared hub

Hello all,
I'm converting an old mountain bike to a nexus 7 hub and I want to
convert my triple chainring to a single. I am aware that I need the
3mm bolts to move the ring to the center position for proper chain
alignment. My current large chainring is a 48t,but it is worn. Should I
replace it with a BMX ring and if so how many teeth? My rear cog is a
20t. What size chain ring will give me the best gear ratio fot the
Nexus 7. Also I do some hilly riding around town and this my be a
factor in my my choice of chainring. Thank you for your suggestions.

Glenn

gdb415 wrote:
Hello all,
I'm converting an old mountain bike to a nexus 7 hub and I want to
convert my triple chainring to a single. I am aware that I need the
3mm bolts to move the ring to the center position for proper chain
alignment. My current large chainring is a 48t,but it is worn. Should I
replace it with a BMX ring and if so how many teeth? My rear cog is a
20t. What size chain ring will give me the best gear ratio fot the
Nexus 7. Also I do some hilly riding around town and this my be a
factor in my my choice of chainring. Thank you for your suggestions.

Glenn

Why do all that? Can't you leave the rear derailleur on to take up the
slack when you shift the front? You would have plenty of gears that way.
Bill Baka

My nexus 7 has a coaster brake and it's essential for the chain line to
have straight alignment to operate properly.This hub does not
freewheel.

Glenn

"gdb415" wrote in message
ups.com...
Hello all,
I'm converting an old mountain bike to a nexus 7 hub and I want to
convert my triple chainring to a single. I am aware that I need the
3mm bolts to move the ring to the center position for proper chain
alignment. My current large chainring is a 48t,but it is worn. Should I
replace it with a BMX ring and if so how many teeth? My rear cog is a
20t. What size chain ring will give me the best gear ratio fot the
Nexus 7. Also I do some hilly riding around town and this my be a
factor in my my choice of chainring. Thank you for your suggestions.

Glenn


I've recently done the same conversion. I'm using the old 38 tooth middle
ring without removing the others (yet) together with the 19 tooth rear that
came with the hub that I purchased already laced up from Harris Cyclery.
Sheldon Brown's online gear calculator at the Harrris website was very
useful in deciding how I wanted to gear, and so far I'm quite happy with my
choice - I seem to have a low enough first to get up anything I've tackled,
and I'm an out-of-shape 65.

ol_paul in SoCal