Chain falling between chainrings when dropping down to smaller ring
02-08-21, 09:30 PM
#1
Senior Member
Thread Starter
Chain falling between chainrings when dropping down to smaller ring
Di2 shifting, New chain, 11sp Connex on Ultegra 11sp double cranks and cassette. When dropping the chain down to the small chainring and while in the highest 3 gears (the cogs farthest from the spokes), the chain drops between the rings. It's a new Ultegra 39T ring.
My initial research on Google says the chain may be too narrow. I suspect that Connex and Shimano had the same chain width though...
My initial research on Google says the chain may be too narrow. I suspect that Connex and Shimano had the same chain width though...
02-08-21, 11:30 PM
#2
Senior Member
Join Date: Jul 2005
Location: Boulder County, CO
Posts: 4,394
Bikes: '80 Masi Gran Criterium, '12 Trek Madone, early '60s Frejus track
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 514 Post(s)
Liked 448 Times
in
337 Posts
This is usually caused by the derailleur not knocking the chain off the big ring with enough enthusiasm. First, make sure the derailleur cage is properly aligned--outer plate parallel to the chainrings and 1-1.5 mm clear of the tallest teeth on the big chainring. Recalibrate your limit screws if you moved anything. If it's still happening, try loosening the lower limit by a quarter turn. With the way auto-trim works on Di2, it's pretty hard to overshift the small ring under any circumstances anyway.
Likes For oldbobcat:
02-09-21, 01:14 AM
#3
I am potato.
Join Date: Jun 2015
Location: Pacific Northwest
Posts: 3,116
Bikes: Only precision built, custom high performance elitist machines of the highest caliber. 🍆
Mentioned: 29 Post(s)
Tagged: 0 Thread(s)
Quoted: 1789 Post(s)
Liked 1,629 Times
in
933 Posts
Is the new 39 tooth ring on backwards? They look symmetrical, but aren't. The teeth are offset inboard/outboard. They ought to be outboard closest to the big ring.
__________________
I shouldn't have to "make myself more visible;" Drivers should just stop running people over.
Car dependency is a tax.
I shouldn't have to "make myself more visible;" Drivers should just stop running people over.
Car dependency is a tax.
Likes For base2:
02-09-21, 01:24 AM
#4
Senior Member
Di2 shifting, New chain, 11sp Connex on Ultegra 11sp double cranks and cassette. When dropping the chain down to the small chainring and while in the highest 3 gears (the cogs farthest from the spokes), the chain drops between the rings. It's a new Ultegra 39T ring.
My initial research on Google says the chain may be too narrow. I suspect that Connex and Shimano had the same chain width though...
My initial research on Google says the chain may be too narrow. I suspect that Connex and Shimano had the same chain width though...
Is the 39T chainring on the right way, and do you have the △ marking aligned with the crank arm?
Likes For HTupolev:
02-09-21, 07:59 AM
#5
Senior Member
Thread Starter
02-17-21, 11:07 PM
#6
Senior Member
Thread Starter
I never saw the triangle. I did have the ring on backwards, and the situation seems to be fixed. thanks to all.
Likes For klasse:
02-18-21, 09:21 PM
#8
Senior Member
Thread Starter
