105 gear probs

moggy12

just bought used planet x pro carbon with ten speed 105 gears went out a couple of days ago all fine went out today all rear gears fine but front derailleur will not change down from big front ring to smaller ring when pressing on left gear to change front to smaller chainring nothing happens checked tension of cable to front derailleur all seems fine lubed inside hood and gear cables but still no luck this is my first road bike any ideas please ps the little front lever under hood does move but no action on moving cable thanks

me-109

I suspect it is just the cable has pulled through the clamp on the front mech and needs resetting.

moggy12

Hi thanks for the info is this a easy fix ? or will bike need to be taken to shop ? if easy fix any links to videos etc to show how its done ? as i'm new to road bikes thanks again

arlowood

moggy12 wrote:

Hi thanks for the info is this a easy fix ? or will bike need to be taken to shop ? if easy fix any links to videos etc to show how its done ? as i'm new to road bikes thanks again

Have a look at this video. Gives you the basics for FD set-up

http://roadcyclinguk.com/how-to/mainten ... lleur.html

However before you tackle the set-up I would do a detailed check of your cabling to make sure you don't have any frayed ends that are causing the inner to stick. That would lead to the problems you describe with the FD not returning to the small ring when the STI lever is activated. The FD spring should default to the small ring so if it's not doing that then it sounds like the inner cable is stuck somewhere

veronese68

As in the post above the spring should pull it back onto the little ring, so it's not that the cable has slipped in the clamp. Follow the video so you can see how it all works.
I would start by releasing the cable clamp on the mech. It should then spring down to the little ring, I'd be very surprised if it doesn't.
Then with the cable still disconnected check it is moving freely. This is the most likely I would say.
If the cable is moving freely look at the shifter. It could just be the cable is badly routed in the shifter.

moggy12

thanks guys for the link and info will investigate more

moggy12

ok watch the vid has soon has I disconnected cable from front derailleur it drop onto smaller ring so that's fine but when pressing small lever to go from big front ring to smaller ring nothing still happens it feels has its not connected has moves from left to right very freely nothing in vid showing how to strip down left front hood to see if cable is still connected or something broke in side so how do I strip front hood down to check many thanks

CiB

Punctuation is good.

No need yet to strip down the hood, and it's a fiddly job. Do all the basics. Does the mech have enough movement by hand to accommodate the range needed to shift from small to large & back again?

Is the indexing in the lever at it's minimum before you attach the cable? If you're on the last but one click before you start there's nowhere left to go. Pull the end of the disconnected cable whilst changing down, to get to the end of the indexing.

Assuming that's all ok, put it all together with a bit of oil down the cable outer, check that it's all moving freely by changing up & down a few times with the free end of the cable in your other hand, then connect it up at the mech. You have to get the cable the right side of the clamp on the 105 FD or it doesn't change at all well. From memory I can't recall which side works best, but there are only two options.

Edit to add that 105 [and Ultegra] rear

shifters have a propensity for failure. Mine did, but not enough to stop working completely, the change down to small ring is abrupt but it happens. The best way to tell is to mimic changing up & down whilst pulling the other end of the cable.

lpretro1

You will probably find that the cable has popped out of the slot at the shifter end. Loosen the cable from the drailleur. Pull lever rubber hood back and find cover plate - remove that (don't lose the little screws) and you should then be able to see cable end. Pop it back in slot and refit

plodder73

More likely that the cable outter has come out of the frame stop, have you checked this?

moggy12

ok tried all suggested took bike to lbs says a part in the left shifter has broken cant be mended so I replaced with £50 sora shifter as the shimano 105 shifters are only sold in pairs and £175 so all ok now thanks

jgsi

moggy12 wrote:

ok tried all suggested took bike to lbs says a part in the left shifter has broken cant be mended so I replaced with £50 sora shifter as the shimano 105 shifters are only sold in pairs and £175 so all ok now thanks

here, http://www.wiggle.co.uk/shimano-105-570 ... lever-set/

Matthewfalle

If you fancy going back to full 105 I'm selling a set of really nice and clean 10 speed shifters in black plus a matching rear mech. All work perfect, shifters are really good nick (bit of wear but no scratches), mech has minor falling over scratches but all straight and works perfect.

moggy12

thanks for the offer but will keep the sora for now