4. How to Calculate Chain Length

Measure the correct length of a new bike chain.

IMPORTANT: Nuts and bolts on your bike should always be tightened to the manufacturer's specifications.
How to Calculate Chain Length
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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.

In future tutorials I plan to discuss the different types of chain connectors and how to use a chain tool to break the chain. The following links provide some more helpful information.

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07/30 Found some unique grease!

hey just thought id share with you since you are all repairing these parts, i came across some grease last weeknd being sold at a small bike festival in manchetser and theres a range of different greases for the bikes. i spoke to them about it they said its a new range but it expected big things due to the standard of the grease so like you do i purchased some, i then took all my bearings out cleaned them all also my chain and sprokets too and apllied this grease and i get no random smell i use to get off my previous grease and it has a very good temp range! its brand new but would recomend it... Read more >>

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How do I get from this
[Image: DSC05597.jpg]
[Image: freewheel_hub.jpg]

to

[Image: 275653337.jpg]

The first picture is the model I have sachs LY 94. 8 speed 12-21.  I have the freewheel and cassette off the wheel like in the ... Read more >>

07/19 Chain is loose when not pedaling

Hi, this is my first post to the forum! I have an old Focus MTB, bought it just recently second hand and I am also new to biking so please excuse me for being naive.
The problem started after the first miles with the bicycle, hearing a noise from the back. It was getting louder and louder very quickly and now, when I am pedaling everything is normal but when I stop and keep the pedals still, while on the road, the chain turns really loose and even goes out of the ring. This happens all the time. Tried with some lube and also tried to see if there is an obvious problem with the chain b... Read more >>

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Removing SOLEUS freewheel DIY without a remover, garage style tip for everyone...

[Image: image1.JPG?dl=0]
https://www.dropbox.com/s/1rrsrp0trrvgbc2/image1.JPG?dl=0

I was trying to clean and grease my wheel bearings, looks like removing the free wheel is a must do type of thing on my bike. I found that a regular old school Chevy GM craiger style lug nut fit in there perfectly. I think its ... Read more >>

07/14 FSA Tempo, 34/50

I have. 2015 Defy 5. It has a FSA Tempo, 34/50 crankset.
Is this compatible with the Shimano 5800 group set? I currently have this setup with my Defy 5. She shifts a little rough on the front dérailleur. I guess what I am wondering is if I need to upgrade the crankset to the 5800? The bike came with a Claris setup. What I do not know is if there is an issue with 'spacing'. My current setup has 5800 shifters, FD, RD, chain and cassette (16 tooth removed and no indexing issues).... Read more >>

07/14 Replacement for RM40-7 hub and cassette

I'm new to bike repair. I use an old bike to ride around my neighborhood with my kids so I'm not a serious rider. My bike has a Shimano FH-RM40 7-speed hub and cassette. It's been difficult finding direct replacements for those components. Is there anything else that will fit without having to change out the entire wheel? I don't mind upgrading if the cost isn't too high. What are my options?

Thanks...... Read more >>

06/25 SunRun vs Shimano vs Epoch Freewheels

I need some advice. I bought a used, "as-is", 2015 Fuji Nevada 1.9 Mountain Bike with 3 x 7 gears from a LBS. I ride it a lot, 10-20 miles 3-7 times a week. The spin-on freewheel was a factory issued SunRun 14-34 and it literally fell apart in 2 months. (Yes, SunRun, not Sunrace) I purchased and replaced the old SunRun with a new SunRun 14-34 and after 3 weeks it is wobbling. I had another LBS check it out, they are scratching their heads. I am wanting a better quality freewheel than the Fuji factory issue of the P.O.S. SunRun Brand. The Shimano Tourney 14-34 makes sense but is there a better ... Read more >>

06/23 chain one link too short

The chain on my exercise bike became too long over time and started "slipping".  So I took the chain off and took off one section (2 links - a female and male) and replaced the pin to complete the repair.  Now the chain is too short to put back on the bike - what I needed was a way to make it one link shorter (not one section=2 links).  Is there now a way to make the chain just one link longer?  Some sort of male to female single extension link? Thanks.... Read more >>

04/26 Rattle help!

Complete carbon fiber (frame) road bike less than one year old - 105  10 speed.  Built it myself and it has been fantastic up to now.  About a month ago I started getting a loud rattling noise everytime a rode over slightly rough ground (chip and seal). on smooth road it is silent.  It is obviously coming from the rear part of the drive.  I always ride on the big ring on the 4th cog from the top - flatland.  Here's what I have checked :  Chain is a good length but I have tried two links shorter and two links longer.  Tried a brand new chain. checked that all bolts are tight, pulleys, ... Read more >>

04/07 How do I open this cassette?

Hi
I have a new project on my hands and am trying to service a cassette of a bike I recently purchase second-hand. The bike I have is a MTB- Shockwave XT950. Can you please let me know how to open this cassette. I have tried various videos however I am unable to find a video for a similar cassette.


Thanks
Hx... Read more >>

04/06 Chain comes off the rear small sprocket on back peddling?

The chain comes off my rear small sprocket on back peddling. The bike rides good other wise.
I have noticed other riders on the side of the road with the same problem. Without a wheel wrench it is quite hard to free up and put back onto the gear cluster. What causes this malfunction?... Read more >>

03/13 12" rule for chain wear?

Being new to this hobby I ran across the 12" rule for chain wear. You pull the chain tight, right on the bike, measure 12 links, the distance between 25 pins, and if it measures 12" the chain is like new. If it measures 12 1/8" you throw the chain away and replace it.
 Something new to check out now. i imagine a worn chain causes shifting problems as well as drive train inefficiency. Do others here you use this method for determining chain wear??... Read more >>

03/08 Changing/replacing a SR Suntour XCT light crankset

Hi,

I am asking this one for my dad (78.5 yrs old).  He just got a bike on craigslist (Marin Redwood), comfort style.

He likes it, but wishes that it had lower crank gearing.  According to the Marin website, I see that it has a "Crankset: Suntour XCT light 48/38/28".

My dad says that he thinks the chainrings are riveted on, but his eyesight isn't the greatest, and I have not had a chance to go there and look for myself.

Do you guys know whether the chainrings are replaceable on this "XCT light" crankset?  I can't find any specific info to ... Read more >>

02/27 Chainring guard for dahon folding bike

Have Dahon folding bike with missing chainring guard.

Looking for a source.... Read more >>

02/27 Relaxy J.P. Veltro Belt

Aloha All,
First of all I have been trying to research this bike and have come up empty.
What I do know, it has a belt vs chain and it looks a little dry.
I don't even know where to begin to find a replacement for it because I can't find it anywhere on the internet.

[Image: CRUISER3_zps60gfuafe.jpg]... Read more >>

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