chain set upgrade help .

dazzzer

My bike has a cheap 9 speed - chain set and square BB and I want to upgrade to the Shimano SLX FCM660 Hollowtech II Triple Chainset. How will I know if the bb will fit in my frame ? Also will the upgrade work with my front derailleur - Shimano FD-M430? My original chain ring size is 42-32-24T the upgrade one would be 44/32/22 .

nicklouse

It will. But you will need to have the BB shell faced. See the topic in the FAQs.
Yes it will but will need to be re set.

dazzzer

When changing from 42-32-24T to 44/32/22 rings do you think i will need a bigger chain or is it to much of a small change to make any difference? I guess i could just wait until i have done the upgrade to check but then it would mean waiting for a new chain if i need one.

nicklouse

if the chain was the correct length before it will be too short.

you will need new gear inner as well for the front mech as it will need moving and adjusting.

dazzzer

I was thinking i know there are different ways to install a chain but i normally install it on the smallest sprocket and smallest chain ring , So i cant see how i will need a bigger chain if i install the chain like this - I was just wondering how you came to thinking i would need a bigger chain ? Unless im installing my chain wrong .

1mancity2

dazzzer wrote:

I was thinking i know there are different ways to install a chain but i normally install it on the smallest sprocket and smallest chain ring , So i cant see how i will need a bigger chain if i install the chain like this - I was just wondering how you came to thinking i would need a bigger chain ? Unless im installing my chain wrong .

Big sprocket and Big chain ring without going through the mech +2 links.

nicklouse

the best way id to follow what the makers say and they say around the two big rings without the rear mech and add one full link (1"). 2 teeth is 1" so there is a posiblity you could lose the rear mech if the chain length is correct.

as you have used guesswork to size your chain you may be fine or you may not be as you are the only one who can know what the length of your chain is.

Ofcause if you never use any combo of big ring and big cogs you may be fine but i would checking it out.

also if a fully with a growing chain length there are other issues.

mrmonkfinger

If your bike is quite well used you will likely need to buy a new chainset + chain + cassette all at the same time.

dazzzer

nicklouse wrote:

the best way id to follow what the makers say and they say around the two big rings without the rear mech and add one full link (1"). 2 teeth is 1" so there is a posiblity you could lose the rear mech if the chain length is correct.

as you have used guesswork to size your chain you may be fine or you may not be as you are the only one who can know what the length of your chain is.

Ofcause if you never use any combo of big ring and big cogs you may be fine but i would checking it out.

also if a fully with a growing chain length there are other issues.

The chain i have has 112 links on it and came installed with the bike , The places i normally shop only sell the kmc chains with 112 links like there is know demand for anything else . I cant think of a time i have ever used the big ring and bigest cog but you never know .

dazzzer

1mancity2 wrote:

dazzzer wrote:

I was thinking i know there are different ways to install a chain but i normally install it on the smallest sprocket and smallest chain ring , So i cant see how i will need a bigger chain if i install the chain like this - I was just wondering how you came to thinking i would need a bigger chain ? Unless im installing my chain wrong .

Big sprocket and Big chain ring without going through the mech +2 links.

Should this be + 3? 2 links and 1 other link to including the master link ?

cooldad

No because you have to take out either half or one and a half full links to fit a masterlink.

nicklouse

dazzzer wrote:

nicklouse wrote:

the best way id to follow what the makers say and they say around the two big rings without the rear mech and add one full link (1"). 2 teeth is 1" so there is a posiblity you could lose the rear mech if the chain length is correct.

as you have used guesswork to size your chain you may be fine or you may not be as you are the only one who can know what the length of your chain is.

Ofcause if you never use any combo of big ring and big cogs you may be fine but i would checking it out.

also if a fully with a growing chain length there are other issues.

The chain i have has 112 links on it and came installed with the bike , The places i normally shop only sell the kmc chains with 112 links like there is know demand for anything else . I cant think of a time i have ever used the big ring and bigest cog but you never know .

Can't say I have even not shortened a chain other on a shopping bike. The number of links is not important as long as it is long enough.