Joined: Jul 2015
Posts: 7,383
Likes: 3,227
From: NW Oregon
Bikes: 1982 Trek 930R Custom, '91 Diamondback Ascent w/ XT, XTR updates, Fuji Team Pro CF road flyer, Specialized Sirrus Gravel Convert, '09 Comencal Meta 5.5 XC, '02 Marin MBX500, '84 Gitane Criterium bike
what is the tooth count of the FRONT large sprocket? it will be far easier the swap on a different, better, LIGHTER crankset and then go to a 13-34 freewheel in the future...
Does your tourney rear derailleur say "MegaRange" on it?
is the large sprocket on the front a 42 tooth?
if yes, then you can locate an old 46/36/24, or something similar to replace the stock crankset... and it will be smart to upgrade to an aluminum crank/sprockets at the same time...
And.. if you get help selecting the crankset, the bottom bracket spindle will not need to be changed... i look at the spindle hole at the inside of the cranksets, and how it relates to the smallest sprocket on both cranksets.... there are three basic configurations... inny, outy, and middy.
and yes, you will need a new chain.. KMC and SRAM make nicely priced, but far better, chains than the one on your bike when it was new.
And since you're new here.. Hi... if you tell us what bike you have, Model and brand, we can look it up if it's not one that's already known.
Last edited by maddog34; 10-21-23 at 06:08 PM.