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Old 09-20-06, 09:04 AM   #1
justuspost
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12 spd upgrade

So my 12 spd Bianchi is my love and joy so replacement is not possible. I am interested in some new wheels, but almost everything new only accepts 9-10 spd shimano where as I currently have a 6 cassette.

So I guess I have 3 options...

New wheels, old cassette- I have no idea if you can put a 6 on one for a 9-10. I'm guessing not, but I guess they could be backwards compatible.

New wheels, new cassette- I have no problem getting a new cassette as long as it will work with my existing 105's. I dont really want to get into buying a whole new grupo

Old wheels- I have 2 sets of mavics now, I just kind of WANT a new cool set, I donít really need one. I like the Mavic 2006 Ksyrium Elite's.

Help me, teach me, guide me.
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Old 09-20-06, 09:21 AM   #2
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If your bike is friction shift, which I suspect it could be, you can run a 9spd cassette with your existing shifters more than likely, but you will lose the indexing.

9/10spd wheelsets are only compatible with 9/10spd cassettes
7/8 are only compatible with 7/8spd cassettes
for 6, there are a few different standards and not all are interchangable as far as I know, but I haven't worked on them enough to know for sure.
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Old 09-20-06, 09:46 AM   #3
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You've got several issues to deal with in changing out the wheels. The first is that you've almost certainly got a six speed freewheel on the bike now, not a cassette. So if you stay with the same hub, you'll have to stick with a freewheel, because freewheel hubs aren't compatible with cassettes, and vice versa..............Are your current wheels 27" or 700c? If they're 27", and you switch to the new wheels you mention, you could have a brake reach problem, as the frame and fork will be designed for 27" rims and the brakes might not reach the new 700c rims, which have a 4mm smaller radius than 27" rims. If your existing rims are 700c, then obviously the brake reach issue is not a problem...........Another thing is rear dropout spacing. With a six speed rear, your bike most likely has 126mm rear dropout spacing currently. The new wheels with the modern cassette hub will have 130mm axle spacing. With just 4mm difference, it's possible to spread the dropouts by hand as you install the wheels, and squeeze the wheel in. You could also "cold set" (fancy name for bend) the rear triangle to 130mm, which would make wheel changes easier, assuming your Bianchi is a steel framed bike. There are excellent instructions for this on Sheldon Brown's website, if you choose to do it........... As for your current 105 group, if you were to go with, say, a modern 9 speed cassette on your new wheels, you'd need a new chain (9speed) , and the old rear derailluer would probably work, along with the shifters, since everything is friction. Good luck-
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Old 09-20-06, 09:55 AM   #4
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Since your initial impetus is to get new wheels anyway, you should buy a new wheelset and the rear wheel will have a freehub. With Bianchi, I'm pretty sure they're using 700c wheels (I don't think the Italians ever went for 27" wheels). You can cold set your frame as well biked notes, but when sticking a 130mm-spaced hub (modern rear road hubs are 130mm between the locknuts) into 126mm-spaced dropouts, I find it easier just to pull them apart the 2mm on each side.

If your bike has Shimano indexed 6-speed, the rear derailler will work with 6, 7, 8, 9 and 10 speed shifting systems - it has the same cable pull ratio. So if you get a modern rear wheel with a freehub, you'll need cassette sprockets and shifters. You could get 8-speed sprockets and 8-speed shifters, or 9-speed, etc. The key is that the number of speeds on the shifters match the number of cassette sprockets.
If your current setup is friction shifting, your rear derailler probably doesn't have the proper cable-pull ratio to be used with Shimano indexed shifting. but you could just run the friction shifters if you're comfortable with them; in that mode your rear derailler will work with cassette sprockets just fine.

If you have indexed shifting, You could go with down-tube shifters if you're comfortable with them, or update to STI (brake/shift levers) or bar-end shifters. Well, you could do friction bar-end shifters too.
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Old 09-20-06, 11:13 AM   #5
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The bianchi has 700's on it. It is index/friction on the down tube at this point. I am interested in the STI, but I modelo americana(sp?) brakes now and I like them alot. (they look cool lol )

I have also had thoughs of a new groupo over the bike, maybe a winter rebuild. I know it will cost 2x as much as the bike did, but it's my love. Maybe upgrade to Shimano Ultegra or Compy all together (but thats another thread). I love the bike, the color and the frame. The cranks are bianchi, so I'm not sure about changing them too.

So it seems that I at least need to change the cassette and chain to add the new wheels and switch to friction shifting. If I want index, that will need replaced too.

Thanks Guys!!!
(anyone want to sell ultegra bb, cassette, shifters )
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Old 09-20-06, 11:24 AM   #6
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Quote:
Originally Posted by justuspost
The bianchi has 700's on it. It is index/friction on the down tube at this point. I am interested in the STI, but I modelo americana(sp?) brakes now and I like them alot. (they look cool lol )

I have also had thoughs of a new groupo over the bike, maybe a winter rebuild. I know it will cost 2x as much as the bike did, but it's my love. Maybe upgrade to Shimano Ultegra or Compy all together (but thats another thread). I love the bike, the color and the frame. The cranks are bianchi, so I'm not sure about changing them too.

So it seems that I at least need to change the cassette and chain to add the new wheels and switch to friction shifting. If I want index, that will need replaced too.

Thanks Guys!!!
(anyone want to sell ultegra bb, cassette, shifters )
Sounds like it shouldn't be too difficult to upgrade to the new wheelset. And Tim made an excellent point about the rear derailleur being compatible with modern Shimano indexed shifters (if your current setup is 6 speed index) of whatever number of speeds you decide to go with, just get shifters to match the number of cogs on the new cassette if you decide to go the modern indexed route on the shifters. If you stick with your current shifters just use them in friction mode (if they're currently indexed for six speed rear and can be switched to friction, just switch them to friction mode) and they should work fine. If they're friction only as it is, they should work fine shifting across the new cassette also-

edit: I just re-read your post, I see that you said the current shifters are six speed index/friction. As long as the rear shifter can be switched to friction, they should work fine-

Last edited by well biked; 09-20-06 at 11:36 AM.
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Old 09-20-06, 11:27 AM   #7
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also.... the bianchi would have an Italian BB correct? I notice that there are a couple different options when looking for BB stuff.
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Old 09-20-06, 12:34 PM   #8
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Depends on the year/model wether BB is Italian. Regardless the current BB should be marked with threading size.
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Old 09-20-06, 01:55 PM   #9
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well its an italian made ~94 Bianchi Nuova Alloro Special... no idea what the BB says other then the ser #
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