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-   -   Downgrading from 9 speed to 8 speed (http://www.bikeforums.net/general-cycling-discussion/885235-downgrading-9-speed-8-speed.html)

damme 04-21-13 09:00 AM

Downgrading from 9 speed to 8 speed
 
I'm getting new bike (most likely this one) that's 3x9 and I will downgrade it to 3x8 so I can use SRT600 gripshifts (the best ever made).

I'm planning to change:

9spd 11-32 cassette -> 8 spd 11-32
9spd chain -> 8 spd
3x9 trigger shifters -> 3x8 grip shifters

Is there big differences in the 8 speed cassettes and chains and what models should I choose?

8spd 11-32 cassettes:

CS-HG51
CS-HG41
CS-HG31

I think I would prefer black cassette (CS-HG31), but if there's big difference in quality then I can choose something else too.

For chains there are few more options:

http://www.bike-discount.de/shop/m43....html?od=&ft=1

114 or 116 links?

Retro Grouch 04-21-13 09:36 AM

I'm not sure what you're trying to accomplish, making so many changes to a brand new bike, but it's your bike so do what you want.

Whatever chain you decide to buy, you'll have to shorten it to fit your bike. Since you're not changing sprockets, the quick dirty way of sizing the chain is to lay the new one along side the old one. Actually, I doubt you'll even need to replace your chain.

damme 04-21-13 09:43 AM

Quote:

Originally Posted by Retro Grouch (Post 15534879)
I'm not sure what you're trying to accomplish, making so many changes to a brand new bike, but it's your bike so do what you want.

I like girpshifts. I don't like trigger shifters. To be able to use the best gripshifts I have to change the cassette from 9 to 8 speed since the gripshifts are 3x8.

Quote:

Whatever chain you decide to buy, you'll have to shorten it to fit your bike. Since you're not changing sprockets, the quick dirty way of sizing the chain is to lay the new one along side the old one. Actually, I doubt you'll even need to replace your chain.
I've read that 9spd chain will work but will worn out faster if used with 8spd cassette.

Retro Grouch 04-21-13 10:07 AM

Quote:

Originally Posted by damme (Post 15534895)
I've read that 9spd chain will work but will worn out faster if used with 8spd cassette.

So? Assume for the sake of discussion that's true. Wait till the 9-speed chain wears out to throw it away. Even a brand new chain that was taken off of a bike will be considered as used and will have very little, if any, resale value.

damme 04-21-13 10:10 AM

Quote:

Originally Posted by Retro Grouch (Post 15534975)
So? Assume for the sake of discussion that's true. Wait till the 9-speed chain wears out to throw it away. Even a brand new chain that was taken off of a bike will be considered as used and will have very little, if any, resale value.

Yeah I can use it no problem, but I still have to know what to buy after that.

Retro Grouch 04-21-13 10:15 AM

Quote:

Originally Posted by damme (Post 15534984)
Yeah I can use it no problem, but I still have to know what to buy after that.

The last chains that I bought were better quality SRAM chains. I like the quick connect links.

fietsbob 04-21-13 10:46 AM

The chain wear is not on the outside link Faces of the chain. to fit in the narrower space
9 speed chains had to be thinner width but pin pitch remains 0.5"

nowadays any 5,6,7,8.. speed cassette or freewheel gets the same chain..

damme 04-21-13 11:01 AM

Quote:

Originally Posted by fietsbob (Post 15535085)
The chain wear is not on the outside link Faces of the chain. to fit in the narrower space
9 speed chains had to be thinner width but pin pitch remains 0.5"

nowadays any 5,6,7,8.. speed cassette or freewheel gets the same chain..

So what chain would you suggest?

dynaryder 04-21-13 04:52 PM

Just FYI,SRAM makes 9spd twist shifters for both SRAM and Shimano. Would be a whole lot easier and cheaper to just swap your shifters.

damme 04-21-13 05:56 PM

Any opinions for the cassette model?

Quote:

Originally Posted by dynaryder (Post 15536040)
Just FYI,SRAM makes 9spd twist shifters for both SRAM and Shimano. Would be a whole lot easier and cheaper to just swap your shifters.

I'm aware that there are 9 speed shifters, but I haven't found shifters that are as good as the SRT 600 made in mid 90's. Every shifters I've tried either don't work as well or they are too big (takes too much space from the handlebar). The worst I've tried are the new XO shifters. I bought a 10spd bike last year so I could use the new shifters on it, but returned both the bike and the shifters after first try.

8spd cassettes and chains are very cheap (around 10 each) so it's really only my time that will be wasted :)

damme 04-22-13 12:44 PM

Anyone know the quality differences between these models and what I should get?

DX-MAN 04-22-13 11:16 PM

Chains and cassettes are what's called "wear-out items", meaning they're meant to be replaced every so often. Don't sweat the quality differences between a $20 cassette and a $50 one, it's pretty small from a reliability standpoint. As far as chains go, I'd go ahead and get the 8-speed chain (yep, cheap, but tougher than the 9); the 9-speed chain is made narrower, and is by nature a bit more fragile; snapping a chain mid-ride is no fun.

Don't let some people snow you -- there's not a THING wrong with 8-speed stuff. I went to 9 because I LOVE the SRAM triggers, and the better ones (X.9, X.0) are 9-speed and up; the 8-speed triggers are definitely OK, just put a set on my daughter's bike, and they work well, but I'm a little picky with my own stuff..... If twisties do it for you, and you like that particular model, ROLL 'EM.

As long as you're buying a reputable brand, and not from Walmart.com or something like it, don't sweat the quality. You're not racing, so "the best" isn't warranted.

Mr. Beanz 04-22-13 11:31 PM

If it were me, I'd change the chain.

Depending on how much wear the present chain has on it, it might skip going to a new cassette.

Otherwise your bike might run fine but with a little glitch then you'll have to wonder. Just change it an be done with it Man! :D

damme 04-23-13 02:47 AM

Ok. I'm going to get these then to match the black theme of 9spd cassette and chain:

http://www.rosebikes.com/article/shi...eed/aid:520162
http://www.bike-discount.de/shop/k51...d.html?mfid=43

ThermionicScott 04-23-13 10:01 AM

Any thought to buying a used 8-speed bike that might already have grip shifters on it? :p

Retro Grouch 04-23-13 10:25 AM

Quote:

Originally Posted by Mr. Beanz (Post 15541828)
If it were me, I'd change the chain.

Depending on how much wear the present chain has on it, it might skip going to a new cassette.

Otherwise your bike might run fine but with a little glitch then you'll have to wonder. Just change it an be done with it Man! :D

Quote:

Originally Posted by damme (Post 15534780)
I'm getting new bike (most likely this one) that's 3x9 and I will downgrade it to 3x8 so I can use SRT600 gripshifts (the best ever made).

Chain will have zero wear. He wants to rebuild a brand new bike around some 8-speed shifters that he likes.

damme 04-23-13 03:01 PM

Yeah I was able to find SRT600 NOS on ebay (bought two pairs lol). I've had the same gripshifts for over 15 years on my current bike and I love them.

Mr. Beanz 04-23-13 04:14 PM

Quote:

Originally Posted by Retro Grouch (Post 15543298)
Chain will have zero wear. He wants to rebuild a brand new bike around some 8-speed shifters that he likes.

Ah I see, missed that part. :D


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