‘76 Dur-ace chainring
09-26-22 | 02:35 PM
#1
Thread Starter
Newbie
Joined: Nov 2018
Posts: 35
Likes: 0
From: KC metro
Bikes: '76 ROMIC Touring Pro 100
‘76 Dur-ace chainring
At 73, small rises are now hills, looking to change my chainring from 46-41 to 46-?? and the cogs are 14,17,22,27,34….will I need to modify my chain length?
Thanks
Halfmile
Thanks
Halfmile
09-26-22 | 03:06 PM
#2
Old fart
Joined: Nov 2004
Posts: 26,404
Likes: 5,339
From: Appleton WI
Bikes: Several, mostly not name brands.
Hard to say. Chain length is a function of gearing, derailleur capacity, and chainstay length. If your derailleur can wrap the current length with a smaller inner ring, no worries (check on small-small combination). If it can't fully wrap the chain on small-small, take a link or two out, check small-small again for wrap, if good, check large-large to be sure that you're not running the chain too short. If it is too short on large-large after cutting a link, you'll need a rear derailleur with more wrap capacity.
09-26-22 | 04:06 PM
#4
Freewheel Medic
Joined: Oct 2005
Posts: 13,572
Likes: 3,315
From: An Island on the Coast of GA!
Bikes: Snazzy* Schwinns, Classy Cannondales & a Super Pro Aero Lotus (* Ed.)
If your BCD is 130mm, 39T chainrings are available.
__________________
Bob
Enjoying the GA coast all year long!
Thanks for visiting my website: www.freewheelspa.com
Bob
Enjoying the GA coast all year long!
Thanks for visiting my website: www.freewheelspa.com
09-26-22 | 04:59 PM
#6
Bikes are okay, I guess.
Joined: Jan 2015
Posts: 8,042
Likes: 3,802
From: Richmond, Virginia
Bikes: Waterford Paramount Touring, Raleigh Sports 3-speeds in M23 & L23, Schwinn Cimarron oddball build, Marin Palisades Trail dropbar conversion, Nishiki Cresta GT, Jeunet mixte
I put an early DA crank on my PX10 and later put a 39 and a 45 on it to replace the stock rings but I'd want a triple these days.
