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Unfortunately, Biopace components haven't been made for years (and other non-round chainrings aren't the same (e.g. Sugino Cycloid, Osymmetric)) and they've become somewhat rare. However, you can some …

You also need to make sure the chain adequately clears the frame under the new chainring size (which may require changing the bottom bracket or other things, if possible). …

chainring size). … You can still do this now. 52/39's are probably marked that way since a lot of people run that combination (and probably put it in the search bar for either chainring). …

According to Velonews, you can use the chainring* with a Shimano setup, but you might get some chain rub (scroll down to compatibility grades). …

I doubt you're going to be able to get the original color of the metal back, and the rust is pretty much aesthetic, so don't worry about it. If you really want to try this, you'd likely need to take …

For most people, they're just a bit pricier. The weight difference is insignificant for almost everyone (excluding possibly serious racers). As for durability, I'd expect its more of a function of m …

As for chainring size, I'm not sure a TX-50 can take a 48t chainring (likely not - you'd have to look at the data sheet, which I also can't find), but most bikes which such a part would be mounted on would …

Sheldon Brown's gear calculator shows you speed at certain cadences (in multiples of 20 rpm) as a function of chainring size, cassette size, crank length and wheel size. …

Basically, so long as the front derailleur is wide enough to carry a 9 speed chain that you're using (so a 9 speed front derailleur would work) without problems, you'll be fine. So, go for it, provi …

Your front derailleur is designed for a specific number of chainrings (double or triple) and specific chainring size gaps. … You can try it out on your own, even if its out of the spec sheet and see if it works (provided the chainring fits on the crankset, i.e. the bolt pattern matches) …

There are a few things you need to check when you select a cassette+chainring wrt the derailleurs: 1) Can the front derailleur take it? … It needs the capacity to be sufficiently high for the chainring+cassette combo, appropriate largest sprocket (and smallest sprocket, if specified). …

To go from a triple to a compact, you generally need to switch the front derailleur for one for doubles (make sure it can be attached to your frame and the right cable pull; front derailleurs have dif …

The FC6603 seems to use a standard 130 mm BCD 52t chainring for the outer ring, unlike the special ones used on some other Ultegra/Dura-ace cranksets. …

No, compact chainrings have 110 BCD (bolt circle diameter) while standard chainrings have 135 BCD.

This is generally a YMMV case -- some chainring+cassette+frame+rider combinations do OK with this, others really need a front derailleur/chain guide for this to work. … This will probably be something like the middle chainring in the front and something in the middle in the back. …