Changed from 6 to 7 speed. Lots of Skipping?
04-11-19, 07:56 PM
#1
Senior Member
Thread Starter
Changed from 6 to 7 speed. Lots of Skipping?
After switching from 6 spd FW to a 7spd FW, I have a lot more trouble switching gears, especially around the 3rd and 4th gear. The chain jumps back and forth if the shifter isn't in the exact right spot. It just seems that the window/margin for error is much smaller now.
It makes sense that the window would be slighter smaller but I wouldn't have thought it'd be detectable and certainly not significantly more sensitive.
The only other thing I changed out was the chain, which is 7 speed compatible. The new FW has a wider range but nothing drastic (11-21 vs 11-25).
I have friction shifters.
Any thoughts? Is this normal? Thanks!
It makes sense that the window would be slighter smaller but I wouldn't have thought it'd be detectable and certainly not significantly more sensitive.
The only other thing I changed out was the chain, which is 7 speed compatible. The new FW has a wider range but nothing drastic (11-21 vs 11-25).
I have friction shifters.
Any thoughts? Is this normal? Thanks!
04-11-19, 08:15 PM
#2
aka: Dr. Cannondale
Join Date: Jul 2009
Posts: 7,734
Mentioned: 234 Post(s)
Tagged: 0 Thread(s)
Quoted: 2155 Post(s)
Liked 3,404 Times
in
1,205 Posts
Who makes a freewheel with an 11 tooth small cog?
Regardless, not normal. The difference in spacing between 6 speed and 7 speed is small enough that nothing should change. Biggest issue is usually chain rub between the smallest cog and the right dropout. Sure you used a modern 6-7-8 speed chain?
Regardless, not normal. The difference in spacing between 6 speed and 7 speed is small enough that nothing should change. Biggest issue is usually chain rub between the smallest cog and the right dropout. Sure you used a modern 6-7-8 speed chain?
__________________
Hard at work in the Secret Underground Laboratory...
Hard at work in the Secret Underground Laboratory...
04-12-19, 06:46 AM
#3
Senior Member
Join Date: Feb 2012
Location: Golden, CO and Tucson, AZ
Posts: 2,837
Bikes: 2012 Specialized Elite Disc, 1983 Trek 520
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 676 Post(s)
Liked 741 Times
in
430 Posts
I had a similar issue when I changed from seven to eight. My solution was a higher quality rear derailleur. I also straightened the slightly bent derailleur hanger--have you checked that?
04-12-19, 09:11 AM
#5
Banned
all new parts ? New, not used freewheel? got a 5~8 speed chain , also new ?
It should work , did you check the derailleur hanger alignment ? [shop service - tool ]
well yea, the idea is a 7th cog added in a frame spacing for 6 ,(126) so the difference is measurable...
..
It should work , did you check the derailleur hanger alignment ? [shop service - tool ]
It just seems that the window/margin for error is much smaller now.
..
Last edited by fietsbob; 04-12-19 at 09:16 AM.
04-13-19, 08:39 AM
#6
señor miembro
Join Date: Dec 2018
Location: Pac NW
Posts: 6,624
Bikes: '70s - '80s Campagnolo
Mentioned: 92 Post(s)
Tagged: 0 Thread(s)
Quoted: 3888 Post(s)
Liked 6,488 Times
in
3,211 Posts
I often use kmc 9-speed chains with my sunrace 7-speed freewheels. It's not wholly necessary. You can make an 8-speed chain work. But I usually find a 9-speed chain works a little better. I get them new on ebay.
04-13-19, 11:53 PM
#7
working on my sandal tan
Join Date: Aug 2011
Location: CID
Posts: 22,629
Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers), All-City Space Horse (hers)
Mentioned: 98 Post(s)
Tagged: 0 Thread(s)
Quoted: 3871 Post(s)
Liked 2,568 Times
in
1,579 Posts
There’s no need for fear, 7-speed is easy to debug in indexed or friction mode. I would start with RD hanger alignment and cable housing. As with other posters, I’m curious which freewheel the OP is using: new, or a custom assembly that might not have all the correct spacers.
Thread
Thread Starter
Forum
Replies
Last Post
Pukeskywalker
Bicycle Mechanics
16
12-02-17 01:39 PM
mazdaspeed
Bicycle Mechanics
5
05-27-10 05:46 PM
