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Attempting to upgrade old 105 to STI and more (long)(6 posts)

Attempting to upgrade old 105 to STI and more (long)luvmaine
Mar 14, 2003 5:33 AM
I have extenive bikeshop repair knowledge, but have been out of the biz for many years and not 100% sure on some issues. However, I have decided I simply cannot afford a replacement bike at this time and want to upgrade. I have very old (10+yr) 105 on a 7yr old Aegis frameset made for Profile. The frame and wheels are in good shape with little milage, so I would like to upgrade to ultegra STI. I also have a 7-spd.

First, my plans are to replace the whole drivetrain. Can I assume the crank profile is the same or might I need a new BB?

Second, I am assumming it would be possible to spread the chainstay and add a spacer to accept a 8spd?

Despite going with a 7 or 8 cassette, I assume I can simply lock out the 9spd STI via the deraillaur, right?

My short-term intent is then to get a new frameset, wheels, etc. next year or two and take it in cheaper phases. Down the road, I may consider going with a triple and realize that will require an entirely new drivetrain, but is the current Ultegra STI capable of handling a triple as well?

Many thanks in advance!
re: Attempting to upgrade old 105 to STI and more (long)Rusty Coggs
Mar 14, 2003 6:15 AM
you don't have to change the crank,but if you do it's likely you will need a new BB.Why mess with 8 speed? Neither 8 or 9 speed casettes will fit your 7 speed cassette hub.7,8, and 9 speed cog spacing is all different. Non dura ace 8 speed shifters would shift your 7 speed tho, but 9 speed shifters won't shift either 7 or 8 speed cog spacing.Your cheap soultion is to try and find some good 8 speed shimano sti shifters.Your rer derailer will work ok,but you will need a STI compatible FD. ...9 speed ultegra shifts a double or tripple.
re: Attempting to upgrade old 105 to STI and more (long)ukiahb
Mar 14, 2003 10:00 AM
check out, lots of good info for upgrading....FWIW also shows that Shimano 7 and Camagnolo 8 spacing is exactly the same going to try Ergo 8 sp levers and rear deraileur on my own old 7 sp 105 bike.
re: Attempting to upgrade old 105 to STI and more (long)KEN2
Mar 15, 2003 7:25 AM
It's been pointed out on this board many times before: you're in for a world of financial pain unless you have access to wholesale prices. Your frame and wheels may be fine, but the rear hub is not compatible with new cassettes so you're looking at a new rear wheel, too. Yes, you will need a new BB. Coupled with everything else you need, your plan will cost more than just buying a new bike.

If you're planning to get a new frameset, wheels, etc. in the next year or two you'll end up spending way more than if you just buy new now. Remember bike companies buy all their OEM stuff at well below wholesale--there's no way you can upgrade your bike for less than the cost of an entirely new bike.
I did the same thing...Matno
Mar 15, 2003 8:18 AM
Over the last year, I upgraded my old Schwinn Supersport from 6 speed to 9 speed STI. Started with the drivetrain and wheels. Here's what I bought:
rear derailleur
hubs/rims/spokes (I built my own new wheelset, but that's not necessary, you only need a new rear wheel. New wheels are a lot nicer though, IMHO)
Dura Ace 9 speed downtube shifters (which I mounted on Aerobars)

As you can see, it starts to add up. You can save a bundle by buying a used wheelset. You can also offset your costs a bunch by selling old stuff on eBay. You would be surprised how much you can get for old parts if they're in decent shape.

Round two started a couple of weeks ago. Here's what I got:
Frame/fork (Cannondale CAAD 4)
front derailleur
STI shifters
GP 3000 tires

Thus I now have an entirely new bike. It has an all new 105 drivetrain, Ultegra hubs with MA-3 rims, and lots of other nice parts (carbon seatpost, Koobi saddle, etc.) The only thing remaining that is not a current part is the single pivot brakes (which work just fine and are actually lighter than double pivot brakes!) It took a lot of time to shop around and to sell the old parts on eBay, but in the end, my net cost for the upgrade was under $450. Add in the cost of shipping, cable housing, and small parts, and it's probably closer to $500. The process was lots of fun. I don't think I could have gotten a deal that good for an entire bike.
One other thing...Matno
Mar 15, 2003 9:59 AM
If you're going to spread the rear dropouts, the frame had better be steel. Aluminum won't spread. At all. I don't know if that's an issue for you or not.

My Schwinn was steel and spread just fine. I never bothered to "cold set" it by actually stretching the stays out. (Sheldon Brown has good directions for doing that on his website). I just squeezed the rear hub in and it worked fine. Not quite as easy to change a tire, but still pretty easy.