Sorry in advance if this question sounds a little elementary
I have been riding BMX bikes in the dirt for a long time and recently decided to take up XC MTB. I can get through the gears and all that but if anyone has any tips or do’s and don’ts they would be willing to share I’d appreciate it. I figured after knocking my chain off a couple times that there are some definite fundamentals that I should know.
Maybe I’m nit-picking, but, sometimes you really still have to worry about chainline cross issues with the outer rear cogs even if you are in the middle cog upfront. Frequently, if you are in 1, 2, 8, or 9 in the rear you will still get some chain rub against the front derailleur. It becomes more apparent with frames with shorter chainstays as the angle the chain has to move back and forth becomes larger.
GG sometimes that is due to a miss alligned front derailleur or sometimes the front derailleur stop is incorrectly set. Both those issues are about 95% of the problems…
Chilly great stuff there with the drawings
I think I have the freak bike!! I’ve had success getting the middle cog up front to shift through all the rear gears on some bikes but I have never gotten it working on my Liquid. For some reason, the best I can ever get is the middle 7 gears without rub. I’ve spent countless hours trying to get it right but 1 and 9 always have some sort of rub when I’m in the middle up front, no matter what. I measured the chain stays in relation to some of the other bikes I’ve had my hands on and it was a bit shorter so I always assumed that might be part of the problem. (But you probably know what they say about the word "assume". It makes an A$$ out of U and ME.) The good thing is, I can basically get the equivalent gear development by using different gear combinations in the front and rear so I’m not missing out on much. The "pro" mechanic I used to go to for my major issues took a try at it and said not to worry about it either since it shifts through everything else so smoothly and quietly. Leave it up to me to go out and fall in love with a bike that turns out to have such an odd quirk.
OK to start release the cable from the front derailleur.
Then looking top down the derailleur cage should do two things.
1. It should run parallel with the chainrings.
2. It should be set so that there is 1mm between the cage and the chain
Looking from the side.
1. shift it into 2nd ring and look at the space between the cage and the large chainring. It must be between 1 and 3mm spacing
Now before attaching the cable turn the adjuster all the way in then turn it out three turns..Attach the cable and lube all the pivot points on the derailleur..
Now once the cable is attached, turn the crank and try to shift into 2nd ring. Once it shifts now you can fine tune it so that when you shift in the middle gears ( if you have 9 at back I am talking about the middle seven) the cages don’t touch.