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Home > Forum > Triathlon Forum > Q for the mechanics. 1x shifting problems

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Q for the mechanics. 1x shifting problems
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NordicSkier
May 21, 19 8:46
Post #1 of 18 (2975 views)
New Force 1 derailleur (replaced an Apex 1), new cable. Bike has less than 500km on it. So the cassette, chain are good as well.

Adjusteded my limit screws.
Adjusted the B screw to get the pulleys as close as possible.
The problem seems to be the cable tension.
I can get it to shift relatively well in either the top gear, or the low gears, but not both.
I adjust the tension for one end and other end shifts poorly or skips gears.

My best guess (and I'm a mediocre mechanic), is that the housing from the chain stay to the derailleur is too short causing the cable tension problems?
The rest of the routing from the shifter to the chain stay is very clean with no major bends.
My other other Force 1 bike has always shifted like a dream and it's housing is probably 2 inches longer.

Ideas?
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Re: Q for the mechanics. 1x shifting problems [NordicSkier] [ In reply to ]
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talking head
May 21, 19 8:47
Post #2 of 18 (2963 views)
Check rear derailleur alignment?
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Re: Q for the mechanics. 1x shifting problems [talking head] [ In reply to ]
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NordicSkier
May 21, 19 9:22
Post #3 of 18 (2935 views)
talking head wrote:
Check rear derailleur alignment?

The hanger? Checked and it's straight.
Derailleur is new out of the box from SRAM and looks straight as well.
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Re: Q for the mechanics. 1x shifting problems [NordicSkier] [ In reply to ]
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JasoninHalifax
May 21, 19 9:26
Post #4 of 18 (2925 views)
the housing from the chain stay to the derailleur is too short causing the cable tension problems?

Picture??

Is the cable run to the correct side of the fixing bolt?
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Last edited by: JasoninHalifax: May 21, 19 9:27
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Re: Q for the mechanics. 1x shifting problems [JasoninHalifax] [ In reply to ]
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NordicSkier
May 21, 19 9:39
Post #5 of 18 (2909 views)


Yes, cable is on the correct side of the fixing bolt.
Last edited by: NordicSkier: May 21, 19 9:40
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Re: Q for the mechanics. 1x shifting problems [NordicSkier] [ In reply to ]
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brider
May 21, 19 10:33
Post #6 of 18 (2872 views)
SRAM (road) needs a much longer loop going into the RD than Shimano. That's quite short there.
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Re: Q for the mechanics. 1x shifting problems [NordicSkier] [ In reply to ]
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grosso27
May 21, 19 10:53
Post #7 of 18 (2856 views)
Is chain sized correctly (big-big + 2 inner + 2 outer)?

Also, you say your b-gap is 'getting the pulleys as close as possible' - B-gap should be 15mm to large cog.
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Re: Q for the mechanics. 1x shifting problems [grosso27] [ In reply to ]
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BigBoyND
May 21, 19 12:56
Post #8 of 18 (2808 views)
15mm? Park tool recommends 4-5mm unless we are talking about different things:

https://www.parktool.com/...erailleur-adjustment
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Re: Q for the mechanics. 1x shifting problems [grosso27] [ In reply to ]
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NordicSkier
May 21, 19 13:00
Post #9 of 18 (2802 views)
grosso27 wrote:
Is chain sized correctly (big-big + 2 inner + 2 outer)?

Also, you say your b-gap is 'getting the pulleys as close as possible' - B-gap should be 15mm to large cog.

Chain size is one thing I am assuming is correct because it was done by a bike shop that sets up a lot of 1x bikes.
I'm not completely confident because this bike shifts terribly.
I'd remove the quick link but I don't have the tool.
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Re: Q for the mechanics. 1x shifting problems [BigBoyND] [ In reply to ]
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grosso27
May 21, 19 13:02
Post #10 of 18 (2798 views)

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Re: Q for the mechanics. 1x shifting problems [grosso27] [ In reply to ]
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BigBoyND
May 21, 19 14:45
Post #11 of 18 (2746 views)
where is that from? Shimano's R9100 manual also says to get "as close as possible"


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Re: Q for the mechanics. 1x shifting problems [grosso27] [ In reply to ]
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xtrpickels
May 21, 19 14:47
Post #12 of 18 (2744 views)
grosso27 wrote:

Also, you say your b-gap is 'getting the pulleys as close as possible' - B-gap should be 15mm to large cog.

Unsure if this is your problem, but I've heard the same from a SRAM employee as well.
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Re: Q for the mechanics. 1x shifting problems [BigBoyND] [ In reply to ]
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Rumpled
May 21, 19 15:12
Post #13 of 18 (2737 views)
SRAM/Shimano = Apples/Oranges

OP has SRAM Force 1x and that is for Shimano
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Re: Q for the mechanics. 1x shifting problems [Rumpled] [ In reply to ]
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BigBoyND
May 21, 19 15:20
Post #14 of 18 (2733 views)
Rumpled wrote:
SRAM/Shimano = Apples/Oranges

OP has SRAM Force 1x and that is for Shimano

Was not aware of the different guidelines. Thanks.
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Re: Q for the mechanics. 1x shifting problems [BigBoyND] [ In reply to ]
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quadlt250
May 21, 19 16:04
Post #15 of 18 (2711 views)
add 2 links and call me in the morning ;)

Everytime i've seen a problem with the shifting on a 1x bike, its been because it was set up like a standard derailleur. These don't pivot around the top pulley wheel, and running the chain a bit longer allows that top pulley to remain closer to the cassette as you shift to the smaller cogs.
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Re: Q for the mechanics. 1x shifting problems [Rumpled] [ In reply to ]
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redlude97
May 21, 19 16:09
Post #16 of 18 (2708 views)
Rumpled wrote:
SRAM/Shimano = Apples/Oranges

OP has SRAM Force 1x and that is for Shimano
+1. Chain length and B-screw adjustment are very different for sram cx1 and shimano 2x
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Re: Q for the mechanics. 1x shifting problems [quadlt250] [ In reply to ]
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NordicSkier
May 22, 19 19:20
Post #17 of 18 (2589 views)
quadlt250 wrote:
add 2 links and call me in the morning ;)

Everytime i've seen a problem with the shifting on a 1x bike, its been because it was set up like a standard derailleur. These don't pivot around the top pulley wheel, and running the chain a bit longer allows that top pulley to remain closer to the cassette as you shift to the smaller cogs.

Nailed it. Chain too short. Added a couple links.
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Re: Q for the mechanics. 1x shifting problems [xtrpickels] [ In reply to ]
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dangle
May 23, 19 20:01
Post #18 of 18 (2480 views)
xtrpickels wrote:
grosso27 wrote:

Also, you say your b-gap is 'getting the pulleys as close as possible' - B-gap should be 15mm to large cog.

Unsure if this is your problem, but I've heard the same from a SRAM employee as well.

Grosso27 is a SRAM employee. And a good cx racer!
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