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Complication of upgrading from 7 to 8-speed cassete

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Complication of upgrading from 7 to 8-speed cassete

Old 01-26-12, 01:14 PM
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skieslord
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Complication of upgrading from 7 to 8-speed cassete

Hi,

I recently upgrade my old GT outpost from it's stock 7-speed cassete. I replace the following to:
Shifter Shimano ST-M410
Cassette Shimano Hyperglide CS-HG30
Front Derailleur Shimano Alivio FD-M412
Rear Derailleur Shimano Alivio RD-M410

After trying to install the new cassette I found out that I needed to get a new freehub body. So I got a new one and got it installed. I have sucesfully installed everything, but there is only one problem and I am not sure whether is normal or not. The rear wheel now is off center, it is closer to the left side looking from behind. Is there something I can do to correct this? or there is not problem at all?
I have attached some pictures to help better what I am talking about.

Thanks.
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Old 01-26-12, 01:22 PM
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fietsbob 
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You need to re dish the wheel . re center it between the ends of the wider axle.

A wheel re-tensioning and truing job.
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Old 01-26-12, 01:33 PM
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skieslord
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Are those three diferent things? I need to do all or those are the options? thanks
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Old 01-26-12, 01:41 PM
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Redishing and tensioning are integral parts of getting a wheel trued. Any good LBS can true the wheel for you for $15-20. From your posts I assume that you are not familiar with truing a wheel yourself, at least not enough to take on redishing. Forgive me if that assumption is incorrect.
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Old 01-26-12, 01:51 PM
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You are right, I was watching some videos about truing a wheel. I tough it only could be a problem with the axle or something. Before replacing the cassete and the freehub I did not have this problem. Also the wheel spin uniformly. I will have to get it to a shop to do so. I live in Mexico so I will need to look for the right terms in Spanish.
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Old 01-26-12, 11:31 PM
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I am looking at your pictures and don't see a problem with the spacing of your wheel. I just see a tire that is off center at the top. Maybe I'm missing something , but it just looks like you need to align your tire in the center. I have added bigger cassettes and it usually means spreading the drops a little so the wheel fits, but wouldn't make the tire go to the left like that.
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Old 01-27-12, 03:29 AM
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Bill Kapaun
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The 8/9 speed Free Hub body is around 4ish MM longer than the 7 speed.
To keep the same OLD, the same amount must be removed in spacers on the NDS.
This means the rim has to be re-dished 4MM back toward the DS.
(it looks more off than it really is)

Unless you're a total Klutz, you CAN do this yourself!
You need a GOOD spoke wrench, such as a PARK SW-42 or similar. It's the "4" sided" wrench. (more like 3-2/4)
http://www.parktool.com/product/p/fo...e-wrench-sw-42

Odds are your wheels have a bunch of miles and the spokes have lost some of their tension. If so, good.
Tighten each DS nipple 1 full turn and check the wheel in the drop outs.
After that, go in 1/4 turn increments.
IF the DS spokes start getting too tight, you'll have to loosen the NDS spokes in the same manner.

before you start, I'd recommend you remove the tire and examine the nipples from the tire side.
IF the DS spoke ends are alread nearly flush with the end of the nipples, you probably can't do it. You'll be popping tubes. Shorter spokes are needed.
IF the nipples are all corroded etc., you are on your own.
You may be able to soak them in penetrating oil and use a combination of the spoke wrench with a good fitting screw driver to loosen them.
This kind of gets to the point of is it worth it.
When the nipples don't turn easily, the spoke wants to really "wind up" and then spring back. It's difficult to turn them all the same amount.
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Old 01-27-12, 06:39 AM
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8spd freehub bodies are taller than your old 7spd one because they need room for the extra cog.
modern 8spd mountain bikes use 135mm rear hub spacing to accomodate this, your bike probably has 130mm spacing.
Since the taller freehub adds space only on one side of the wheel, the rim is now off center. increasing the spoke tension on that side while decreasing on the nondrive side will recenter the wheel;
-however this will also result in a weaker, less symmetrically dished wheel
squeeing 135mm hub into a 130mm dropout also isn't that ideal. if its a steel frame you might spread it to be wider.

Probably too late now that you've got all the parts, but do you really have a compelling reason to need an 8th cog at the cost of a weaker wheel and having to replace the shifters etc?
Personally I wouldnt call it an 'upgrade'....
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Old 01-27-12, 01:17 PM
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I actually measured the dropouts before buying, it is actually 135mm, I did not want to espread the frame in any way. I had to replace the shifters anyway because the front one was not working properly, since they were a old shimano acera, I tought thay will be much better to go to 8 speed, no much difference but was a good time to replace all old components on my old bicycle.
I will take it today to a shop to true the wheel like pretty much everyone suggested. I will post what happened.

Thanks to all.
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Old 01-27-12, 01:25 PM
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Originally Posted by skieslord View Post
I will take it today to a shop to true the wheel like pretty much everyone suggested. I will post what happened.
Be sure to tell them that the wheel needs to be redished.

How old is the wheel? Redishing can be a simple task or it can be a royal PITA. It depends on how badly seized the nipples are onto the spoke threads.
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Old 01-27-12, 01:44 PM
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Yes I will. I hope the wheel is in good condition and it's not to old probably two years old, I put new tires around 4 weeks ago and inside looks fine.

Originally Posted by Retro Grouch View Post
Be sure to tell them that the wheel needs to be redished.

How old is the wheel? Redishing can be a simple task or it can be a royal PITA. It depends on how badly seized the nipples are onto the spoke threads.
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Old 01-28-12, 10:47 AM
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I sent bike to a shop, they dished and true the wheel. also they did a complete tune up and service regarding another shifting problem I had. Also besides all the parts I changed also I needed to replace the chain for an 8-speed one.

Old GT outpost is working like new.

thanks to all of you.
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