Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take Part in the June Giveaway to Win the Kazam Buddi 20" Aluminum Trailer Bike


Slow & variable ' gear change speed '
#1
I have a new lapierre technic hardtail mountain bike with shimano gears.

They work fine, as in, they change to the correct gear almost always, the problem is changing down (to smaller circle gear) on the rear gears (derailer is it?). ... It is very slow.

It is like click, gear moves, 1 second later, the chain bites into new position

This 1 second is the problem, and the worst thing is it is never the same duration .. I.e. I never know when the new gear setting will bite. This makes for a slow ride when you are trying to accelerate.

So any ideas where to look? This a known problem? Changing up gears (to a bigger circle) is quick and fine, it is just down.

I had a very cheap bike before that had twist gears that changed much faster and ALWAYS at the same rate.

Thanks for reading
Gavin
  Reply
#2
The rear derailer is spring loaded to pull the chain down to the smaller cogs. The spring tension has to not only pull the chain over but it has to overcome the friction of the cable within the housing. I would start by lubricating the derailer and clean if necessary. Then replace the cable and housing. These steps will allow the derailer springs to pull the chain over with the least resistance.

(08-20-2011, 09:09 AM)gavinr Wrote:  I have a new lapierre technic hardtail mountain bike with shimano gears.

They work fine, as in, they change to the correct gear almost always, the problem is changing down (to smaller circle gear) on the rear gears (derailer is it?). ... It is very slow.

It is like click, gear moves, 1 second later, the chain bites into new position

This 1 second is the problem, and the worst thing is it is never the same duration .. I.e. I never know when the new gear setting will bite. This makes for a slow ride when you are trying to accelerate.

So any ideas where to look? This a known problem? Changing up gears (to a bigger circle) is quick and fine, it is just down.

I had a very cheap bike before that had twist gears that changed much faster and ALWAYS at the same rate.

Thanks for reading
Gavin
  Reply
#3
Also you can look up some videos on youtube about adjusting the rear derailer. Slow and clumsy gear changes mostly are influenced by a badly adjusted derailer. From my experience the lubrication of cable housing doesn't influence gear changes that much that you can notice it Smile
  Reply
#4
(08-20-2011, 11:46 AM)Paulius Wrote:  Also you can look up some videos on youtube about adjusting the rear derailer. Slow and clumsy gear changes mostly are influenced by a badly adjusted derailer. From my experience the lubrication of cable housing doesn't influence gear changes that much that you can notice it Smile

A dry inner cable and/or a cracked and worn outer will cause the gear changes to hang up. In a shop I worked at one of the easiest fixes with gear changes was with dry / worn cables. Ride safe.
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
Would you use WD-40 for cleaning and/or ...
Today 09:57 PM
Freehub pawls or ratchet : Grease or oil...
Today 05:11 PM
Anybody watch on YouTube Global Mountain...
Today 05:03 PM
Bianchi Oltre Pro Garmin Mount
Today 10:57 AM
How to keep your bicycle safe?
Yesterday 03:20 PM
1998 Cannondale H300 Hybrid
Yesterday 03:16 PM
1994 Trek 730
Yesterday 03:15 PM
Community Discussion Cycling Myths
Yesterday 03:01 PM
Sora, shift gear cable stuck (wrongly in...
Yesterday 12:12 PM
Man on e-bicycle, Fire, pregnant woman!
Yesterday 09:15 AM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. Jesper
30 posts
no avatar 2. Flowrider
24 posts
no avatar 3. meamoantonio
21 posts
no avatar 4. GirishH
18 posts
no avatar 5. enkei
18 posts