Originally Posted by
smashndash
I, too, refused to buy a chain checker that didn’t account for roller wear/size. Too many stories of those things failing new chains. I bought a 6” ruler and 12” ruler instead.
Without taking the chain off, I had great difficulty using the 12” ruler. I assume you’re supposed to measure the chain under tension, so I tried to measure the upper drive portion of the chain. I couldn’t really fit the 12” ruler in there. So I tried the 6”. If my math isn’t wrong, 0.5% of 6” is 0.03 inches. 1/4 of 1/8”. How am I supposed to eyeball that? And how do I know I haven’t just positioned my ruler wrong? Heck, even with the chain off, 1/16” seems mighty hard to eyeball. Maybe I’m not doing it right. And if I’m being honest, I’ve compared rulers before and definitely seen ones that were off by that amount across 12”.
Anyway, I bought the CC4. Glad a skeptic like me is having a good experience. I’ve yet to use it
My ruler is metric and imperial. For shorter chainstay bikes I use the metric measurement of 10 links. 25.4 cm is new, 25.5 mm is 0.5% elongated. I always measure on the bike, after all this is just to test... the chain comes off when it gets replaced.
Yeah, I also questioned the ruler accuracy. but new chains were exactly 12" with my ruler when stretched.
And yes, it is really hard to read and keep the ruler at the same part of the pin on both sides while stretching the chain.
Originally Posted by
GeneO
I did pick one of these up and it appears to work well on my unstretched chain. Only minor complaint is you have to put a finger around the chain to properly tension it and this gets grease on ya.
It is an improvement over the CC-3.2.
Thanks for the heads-up.
You can tension with the crank when the rear wheel is on the ground.