Originally Posted by
tellyho
Is there a disincentive to getting new rings for your DA crank? I've not been in the market, so I don't know if they're hard to find. I would think it'd be pretty straightforward ,and possibly even revenue-neutral, once you sell the originals.
Yeah, they don't interchange on the DA one because the granny is bolted in to middle and not the crank itself. It uses a 92mm BCD.
Originally Posted by
HillRider
If you want a triple with more options, get an Ultegra 6500. It has the common 130/74 mm bolt circles and there are a lot of gearing possibilities. It uses the same triple 118 mm Octalink bb as the D/A.
BTW, have you calculated the gear table for your current gearing? The 39x13 combination is 81 gear-inches and the 39x12 is 88 gear-inches. The 53x17 is 79.5 gear-inches and the 53x16 is 89 gear-inches so you don't have to cross chain in the 39T ring to get the same ratios. The 53 ring will provide them with outcross chaining.
I'm thinking the Ultegra is the way to go, maybe along the lines of a 52/42/30. I'm going to do the gear calculator today.
Originally Posted by
DaveSSS
Sounds like a failure to plan your gearing before buying and installing new parts.
True, but it was time sensitive, got the brand new DA crank and BB for 175 shipped. If I sold it right now with 26 miles on it, I could probably still make money.
Originally Posted by
DaveSSS
Using the middle ring with the is of second cog is NOT cross-chaining. The middle ring on a triple is within 1-2mm of the same postion as the big ring on a double and I treat it the same way. I never had a problem using the middle ring and smallest cog.
From Shimano's instructions, it isn't a recommended gearing. The chain looked pretty crossed, didn't seem like a performance penalty, just way more crooked than I would like.
Originally Posted by
DaveSSS
Your 50/44/28 is a real oddball, with extremely little difference between the 50 and 44.
It is an oddball, but like HillRider says, it was originally used with a 5 speed freewheel on my touring bike. I always used the outer (50) with my old freewheel (approx 14-28 or something like that) but when I did the 27' -> 700C conversion, I got a good deal on a 9 speed DA cassette (12-21) and liked the gearing choices in the 44 a bit more.
Originally Posted by
DaveSSS
I assume that you ride enough flats that the 18T is considered important.
True story, Chicago is pretty flat.