4. How to Calculate Chain Length
Measure the correct length of a new bike chain.
When you purchase a new chain, it usually comes with extra length so that it is compatible with most drivetrains. How do you know how much length your bike will need? Well, it's really quite simple...
The first step is to wrap the chain around the largest sprockets on the front and rear, so that the ends meet on the largest front chainring. For this step, it really important to not run the chain through the rear derailleur.
Next, position the chain on the chainring's teeth at the tightest spot you could connect the chain. Now add one whole inner and outer link, so that you have approximately one extra inch of slack in the chain. That will be the optimal length for most systems.
I'm having an issue on my CX bike. Which is shimano with 38/48. On the last 2 rides when I'm in the lowest gear on the cassette my chain drops off the small chain ring. It doesn't happen on the 2nd from lowest gear on the cassette.
I decided that maybe my rear mech was limited enough so perhaps was pulling the chain off at an angle. Therefore I played with the Lo limiter screw and indexing adjustment to ensure that wasn't the case. On on my bike stand it was fine but once riding the bike again it dropped? Given that it has only just started happening could be be wear relat... Read more >>
I have an older frame with an ultra-6 freewheel. When the rear wheel is removed the stays measure 122.78 (hub is a 120 for the ultra-6). I can cold bend it out to 126, I'm sure, but do I need to if I just put a regular 6-speed freewheel on? I'm not sure how tight that would be as far as the chain scraping the frame. has anybody tried it? Has anybody bent a 120 out to 126 or 130 without problems?... Read more >>
I recently picked up a Park CC-3.2 to put in my portable bike tool-bag (12 inch ruler won't fit). With it one of my chains that measures fine with the ruler, fails, even at the .75 side. Reading on the subject states that the CC-3.2 doesn't take into account roller wear, which the Shimano TL-CN41 does. So, I took a popsicle stick (perfect thickness) and shaped it to press the roller nearest the drop-in end of the Park to give similar results to the Shimano and eliminate roller wear anomalies. Sure enough, measurements come out differently, and what "failed" previously with the Park, now ... Read more >>
Hi all. 1st time post. I am unablr to remove the cassette from my rear tyre. I followed the easy tutorial on bikeradar but havent managed to get any success.
See link to pics of my cassette and the lockring i bought. http://s1067.photobucket.com/user/Nexus62/library/Mobile%20Uploads
I think i know where i went wrong. The lockring i purchased didnt fit properly, so i just used a spanner to remove the bolt. Now all that is left on the wheel is the old cassette..
... Read more >>
i've recently started riding my bike for exercise. was going well for a couple weeks, but a few days ago the chain on my bike has been slipping off of what i think is the gear shifter. it is very annoying and i haven't been able to ride my bike because of it.
Edit More info: i have a Schwinn Ranger 10 speed. the gear only slips like that in high gear. it does not slip while in low gear.
i have a video of basically what happens. can't get a video of it while riding. it is a video of it slipping off stationary.