Gear slip

[mikeloveshisrockhopper]

Evening all. My specialized Rockhopper has just developed an irritating gear change issue

Basically, whatever cog I'm in on the front triple, whenever I try to engage the largest rear cog, it simply won't settle in and jumps about. On the rare occasion it does settle in, when I change up, it actually jumps to the third biggest cog, so missing out the second biggest one. Every other gear combination works like a dream and the bike is a joy to ride.

Simple adjustment or do I need to get it to a bike shop? It had a thorough service about a year ago and had the rear wheel bearings changed last month

Thanks all.

Mike.

 

[Smokin Joe]

Sounds like a simple adjustment of the cable as it's gone a bit slack. Turn the barrel adjuster (Where the cable enters the rear mech) anti clockwise a quarter turn at a time and see if it improves.

 

[mikeloveshisrockhopper]

Cheers Joe. I'm mechanically inept but that sounds within even my capabilities.

 

[screenman]

Is there any chance you have layed the bike on it's side, knocked the rear mech slightly, had someone take it off and refit it? What I am getting at is that is the symptons of an out of aligned rear hanger. Which when playing with gears should be the first thing to check.

 

[mikeloveshisrockhopper]

I put the wheel in to a bike shop for a service where he cleaned, tightened and lubricated everything as well as replacing the bearings. He never had the whole bike though. I guess the gear hanger alignment is also a DIY fix?

 

[screenman]

I put the wheel in to a bike shop for a service where he cleaned, tightened and lubricated everything as well as replacing the bearings. He never had the whole bike though. I guess the gear hanger alignment is also a DIY fix?

Not really, unless you have the correct tool.

How many miles on this chain and cassette?

 

[Kajjal]

Likely causes

rear mech needs adjusting. (cable tension adjuster)
New chain and cassette needed due to chain stretch.

Less likely

Mech is damaged or twisted

 

[Yellow Saddle]

Likely causes

rear mech needs adjusting. (cable tension adjuster)
New chain and cassette needed due to chain stretch. Totally unlikely.

Less likely

Mech is damaged or twisted

 

[mikeloveshisrockhopper]

Everything was replaced including the chain about a year ago. I am very roughly guessing I have done 1200 miles since then. That is a very rough guess though as I also ride a Defy 1 so I am not sure what the mileage split is between bikes.

I'll visually inspect it tonight to look for misalignment. I'll give this cable tension adjustment a go too.

Thanks all

Mike