Tech Talks: Chain Line 101, Presented by Park Tool - Video

53 1

Lornholio (Feb 22, 2018 at 1:48)

How to stop chains dropping while backpedalling: don't backpedal. Well said Calvin.

6 18

pinnityafairy (Feb 22, 2018 at 6:18) (Below Threshold)

A poor-quality hub or freehub body will cause you to drop chains also. I cannot emphasize enough how important a quality friction-free rear hub is to keep a chain on a single ring setup without a guide.

31 1

Obidog (Feb 22, 2018 at 7:15)

@properp: please emphasize just enough...

1 2

pinnityafairy (Feb 24, 2018 at 11:09)

@Obidog: please share your knowledge with us wise one. You can lead a horse to water but you can't make him drink. I can't emphasize this enough.

1 1

Obidog (Feb 26, 2018 at 4:24)

@properp: if I had knowledge of a 'friction-free' hub (or friction-free anything else for that matter) I wouldn't be sharing it here!

1 0

pinnityafairy (Feb 26, 2018 at 14:56)

@Obidog: I9, Cris King. Now you do. Build bridges not barricades

1 1

Obidog (Feb 27, 2018 at 3:00)

@properp: Lets just revisit the key wording: 'friction-free', and again, 'friction-free'. Not sure you'll find that sort of performance promise on any product, be it from CK, I9, NASA or anyone else!

40 3

dwojo (Feb 22, 2018 at 2:53)

Someone needs to tell Calvin 28.99 isn't 29. Maybe put him in touch with a sram engineer

18 3

Obidog (Feb 22, 2018 at 3:24)

aaagh, and again as soon as pressed play: "15.1, lets go with 15" Does he not realise how much thought, time and marketing research went into deciding that 15.1mm was the way to go????

11 1

jamesdippy (Feb 22, 2018 at 0:51)

Calvin i love these videos

Can you please do one of how to fix a pool?

It needs to start with, 'i'm here to fix your pool'....

10 0

BartDM (Feb 22, 2018 at 2:59)

at 5:25 "there is no industry standard for this..." I can see some brainstorming in the bike industry now...

7 0

Kramz (Feb 22, 2018 at 1:08)

Damn, 6 millimeters is a whole gear change worth of difference. I like his total "eff-it" attitude, "if it ain't broke, don't fix it". That's what mountain biking is about, haha.

5 0

Boardlife69 (Feb 22, 2018 at 1:40)

Is my chain on a line of any sort? Yes, cool keep riding. No, cool keep riding and figure it out later.

10 2

Obidog (Feb 22, 2018 at 3:21)

"75.8.....call it 76" Whaaaaaat??? Out of touch Calvin...! There's room for at least two whole new standards between 75.8mm and 76mm!

9 4

OllyR (Feb 22, 2018 at 5:29)

"a bike with a poor chain line will run rough, suffer from premature wear, and possibly give you all sorts of headaches when things get dirty"

Funnily enough, they don't put that in all the BS persuading everyone that 1x is the future.

5 1

the-burd (Feb 22, 2018 at 8:12)

Haha, it was the future 5 years ago. Most bikes come 1 by and it's not a problem.

1 0

ugez (Feb 25, 2018 at 0:30)

@longlongpelaman: It's not a problem now as we are expected(or told) to change our chain at least once a year. More money for them.

8 0

pinnityafairy (Feb 22, 2018 at 6:20)

If it ain't broke don't fix it. If it ain't broke don't make a new standard.

4 0

dandriller (Feb 22, 2018 at 9:35)

Just don't back pedal too much... Explain that to a customer! I had a guy who wanted to return a bike because it would derail on the cassette when he back pedaled a bunch... I tried to explain effective back pedaling is a nonessential function. Dude just didn't get it. It didn't help the sales manager convinced the customer we didn't build the bike correctly. I was shocked that pedaling backwards was so important to this customer!

4 0

DhGabe (Feb 22, 2018 at 10:22)

A mechanic friend once shared a story with me that was similar about frame flex. A Jackass... I mean customer was mashing on the pedal from one side of the bike and complaining that the frame was broken because it flexed to much. My friend looked at him and said well I've never seen anyone ride a bike like that so you have nothing to worry about.

5 0

TheLongMan (Feb 22, 2018 at 13:30)

Maybe he likes to do long fakies in the skatepark

3 0

vastamyrkky (Feb 22, 2018 at 2:01)

Raceface suggests the following for the chainline:
142mm hub 48-50mm chainline
148mm boost hub 51-53mm chainline

The bike on the video fits these guidelines. I guess as long as you don't have weird dropouts or try to mix parts that are not designed to be mixed together you are good with those numbers.

7 0

TheDwayyo (Feb 22, 2018 at 9:25)

At least he didn't pour any beer out this time... #neverforget

4 1

Flowcheckers (Feb 22, 2018 at 1:37)

Ditch the calipers and calculations and get a chain line measuring tool. If you do lots of climbing and not alot of flatland riding it makes sense to move your chainring just inside the center of the cassette.

3 1

iffy (Feb 22, 2018 at 2:54)

Its easy enough to just eyeball it no need to measure anything, depending on your crank type a few washers to bring the chainring in a mm or 2 will extend the life of your drivetrain if you spend a lot of time climbing.

3 0

Gfromars (Feb 22, 2018 at 11:10)

I'm an idiot..I thought that hole under the bottom bracket was designed for those people who let their bikes under the rain...drainage engineering ;D

3 0

TheLongMan (Feb 22, 2018 at 13:31)

Hahaha me tooo!!!

1 0

djzatorze (Feb 24, 2018 at 0:44)

I though it is for some production needs, hanging in drying room or something

2 0

blacksim549 (Mar 4, 2018 at 1:59)

It is for drainage.

2 1

dldewar (Feb 22, 2018 at 11:20)

Calvin I love your videos but one comment - at 4:30 in you describe a technique to zero out the rivets on the back of the cassette. You could simplify your life and just measure the cassette with the smaller sprockets face down rather than the way you do it in the video. Just avoid the rivets when using your depth gauge. Keep up the good work!

1 0

Otago (Feb 22, 2018 at 15:44)

Another tip - carbon down-tubes are often not centered (or symmetrical) to the BB, so measuring the DT and halving it doesn't give you the center of the BB. I measure at the the BB, extend a line on the DT and measure the chainline from the ring.

3 0

JohanG (Feb 23, 2018 at 4:16)

Acktually, the big cog is dished so he would need a straight edge across it if he did that.

3 0

ptitbedardr (Feb 22, 2018 at 6:19)

Ooops here is the link.
www.wolftoothcomponents.com/pages/boost-chainline-and-chainrings

2 0

lukeisdumb (Feb 22, 2018 at 8:05)

The b-limit on that Shimano derailleur was like a mile away, that's gonna cause a lot more shifting issues than your chainline haha

1 0

iammarkstewart (Feb 22, 2018 at 10:11)

I just realized Calvin is left handed. I now have to rewatch all of his videos and figure out the mirror procedure. Also, he almost slipped the bike swap right by me. Calvin is a shifty dude who needs to eat a burger or 5.

3 0

bicitechmtb (Feb 22, 2018 at 10:24)

It not more easier check if the chainring is in line with the 5th sprocket (10 speed) or the 6th (on 11 speeds)???

5 1

sobearbikewrench (Feb 22, 2018 at 4:02)

I love my Pinion!

2 0

ptitbedardr (Feb 22, 2018 at 6:18)

Neat video by Calvin Here is an article by wolftooth components regarding boost chainlines that some may find interesting.

4 2

BartDM (Feb 22, 2018 at 2:50)

``75, 8 it is called 76...`` I don`t think that sram would like it...

2 0

huppe (Feb 22, 2018 at 6:45)

40.99 cassette width? I'm buying.

1 0

donpinpon29 (Feb 22, 2018 at 0:32)

Is that a pedal susbtitute for fixing the bike? Holy molly

3 2

Buzzyny (Feb 22, 2018 at 6:07)

Brought to you by Park Tool. Wouldn't want those hands to get mashed up on a real pedal. It can be yours for 4 easy payments of $49.99!

3 0

showmethemountains (Feb 22, 2018 at 9:05)

Yes, they make some sense for shops building up new bikes that don't come with pedals. The tool is only around $10 for a version without threads that just sticks in the crank. There's also one with a couple threads to keep in place if you're going back and forth on other adjustments. Then install the pedals near the end of the build, or never because the customer has their own pedals to install at home