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shimano crank compatibility(13 posts)

shimano crank compatibilitycck
Aug 27, 2001 10:18 AM
i have the 2001 trek 1000 and want to upgrade from a triple crankset to a 52,39 double crank. what things to i need to buy to do this or can i just buy the crank. also what is a good deal for a good crank in the 52,39 size. basically what is the easiest way to upgrade to this crank?
re: shimano crank compatibilitygrzy mnky
Aug 27, 2001 10:31 AM
Easiest way is to remove the two smaller chainrings and replace the middle with a 39 from an double unit. If you want to go with a double crank and do things "technically correct" you'll need the double crank , the shorter BB, and possibly a new double front der. (plate design is different).
re: shimano crank compatibilitystevemtb
Aug 27, 2001 1:05 PM
Adding to the "technically correct" list of components, how about a new STI shifter for the front derailleur?
Negativegrzy mnky
Aug 27, 2001 1:36 PM
That would depend on the level of STI components used - the single Ultegra, 105, Tiagra shifter does both doubles and triples. Only Sora requires a different lever, but I don't believe that this is waht's used on the original posters Trek bike. See www.shimano.com for more info on partz.
Trek 1000jtolleson
Aug 27, 2001 2:03 PM
I think the 1000 is all Sora.

I can't see investing any of this dough in modifying a $600 bike, and the resale market for such afforable bikes has a nice niche in the "triple crank" crowd. I'd leave the bike alone. You can set the low limit screw to deprive yourself of access to the granny gear, get the use you want out of the bike, and then upgrade.
Yupgrzy mnky
Aug 27, 2001 2:13 PM
It's like putting a v-8 in a VW - it can be done but you're still running a VW.

no doubt about it the most economical way to upgrade is to replace the bike and get full resale value. the piece part price of individual components is staggering when compared to some of the deals on new rides setup the way you want them.
Trek 1000cck
Aug 27, 2001 4:30 PM
well sorry jtolleson, you probably have alot more money than me so you give me the money and i will buy a better bike. if i had it my way i would get a $5000 dollar bike.
Trek 1000Rusty Coggs
Aug 27, 2001 6:08 PM
He told it right..IMHO. You just did not want to hear. It makes nosense to buy a low end bike with the wrong stuff on it,then throw half or more of it away to upgrade.The best crank for the money would be a sale deal on a 105.You will need a matching BB too.
You've misunderstood me...jtolleson
Aug 28, 2001 6:39 AM
and obviously my post offended you. I apologize.

I didn't mean that at all. What I meant was that you could SAVE money by just keeping the triple and enjoying the bike. I think the Trek is a fine entry level bike, and you'll see that I recommend it here often. I think that patriotic paint job is real purty, too!

If you don't want a triple for aesthetic reasons, you can set your low limit screw and remove the interior cog. I just didn't see investing $200 in a component swap as being necessary.

Don't assume that I'm one of those folks on this board on the attack; I'm really quite the opposite.
You've misunderstood me...cck
Aug 28, 2001 3:39 PM
but i want the 39 tooth as opposed to the 44 tooth because the 44 is to big for intense climbing and the smallest chain ring is to small for my cadence
You've misunderstood me...Rusty Coggs
Aug 28, 2001 5:00 PM
You could replace the 42 with a 39, or use a cassette with smaller cogs in the rear. Tehre ARE easier ,cheaper ways.
You've misunderstood me...jtolleson
Aug 29, 2001 3:01 PM
If all you want is to tweak your gear ratios, you can do that without the involved upgrade you were proposing. And as for how that explains your overreaction to my post, I'm still lost.
Most upgrades don't make economic sense.Spoke Wrench
Aug 27, 2001 6:56 PM
I can think of four exceptions:

1. Something has broken and needs to be replaced anyway.

2. Somebody gives you free parts.

3. You love the frame, you plan to keep it and ride it forever, and ITS THE RIGHT SIZE.

4. Your hobby is upgrading bikes and you don't care about the economics.

The most economical way to buy bicycle components is bolted onto a new frame.