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Replacing Triple Crankset on Trek 1000 - 2003 8 speed

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Replacing Triple Crankset on Trek 1000 - 2003 8 speed

Old 07-12-14, 02:40 PM
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dwcleck
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Replacing Triple Crankset on Trek 1000 - 2003 8 speed

I don't know much about bicycle mechanics but have replaced wheels/cassettes, handlebars but don't know anything about cranksets or BBs.

My wife is wanting to replace her Suntour Superbe crankset (not replace the BB) with a crankset like this:

Universal Cycles -- Shimano FC-A073 Tourney Triple Crankset

Some of the Trek specs are here:

2003 1000 - Bike Archive - Trek Bicycle

And here

2003 Trek 1000 - BikePedia

But will this fit? She wants a little smaller chainset rings for easier climbing and wants a Black crankset.

Any advice would be greatly appreciated.
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Old 07-12-14, 04:23 PM
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The crank you show will not give any lower gearing since the small ring is the same size as the one that is already on the bike. Unless the current crank is worn out, it is far better quality than the one you propose to buy. That leaves colour. There is also no guarantee that the new crank would use the same spindle length as the old one so you might also have to buy a bottom bracket
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Old 07-12-14, 04:24 PM
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You will almost certainly have to change the bottom bracket to match whatever crank you choose.
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Old 07-12-14, 04:26 PM
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dwcleck
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Appreciate the advice guys. Anything you could propose to make this bike significantly lighter in weight?
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Old 07-12-14, 04:33 PM
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Significant weight loss pretty much always involves significant cost. Unless you can remove pounds of weight from a bike you wouldn't even notice any gain in performance anyway. If you want much lower gears you might look into using a mountain bike rear derailleur and a larger cassette along with a new chain. Any Shimano mountain bike rear derailleur with the exception of the new 10 speed components will work with your current shifters
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Old 07-12-14, 04:35 PM
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Originally Posted by dwcleck View Post
I don't know much about bicycle mechanics but have replaced wheels/cassettes, handlebars but don't know anything about cranksets or BBs.

My wife is wanting to replace her Suntour Superbe crankset (not replace the BB) with a crankset like this:

Universal Cycles -- Shimano FC-A073 Tourney Triple Crankset

Some of the Trek specs are here:

2003 1000 - Bike Archive - Trek Bicycle

And here

2003 Trek 1000 - BikePedia

But will this fit? She wants a little smaller chainset rings for easier climbing and wants a Black crankset.

Any advice would be greatly appreciated.
If she wants a better crankset for climbing, get a compact double but, as others have said, you will need to replace the BB as well.
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Old 07-12-14, 04:38 PM
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Nice even if 9 speed? This may help. She has trouble on the hills with a heart condition.
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Old 07-12-14, 04:41 PM
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"9 speed" derailleurs are only 9 speed when used with 9 speed shifters. They are very happy to be 8 speed derailleurs when used with 8 speed shifters. I am currently using a "9 speed" derailleur on my touring bike with an 8 speed shifter and an 8 speed cassette

Last edited by alcjphil; 07-12-14 at 04:57 PM.
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Old 07-12-14, 05:00 PM
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Originally Posted by bikemig View Post
If she wants a better crankset for climbing, get a compact double but, as others have said, you will need to replace the BB as well.
According to the BikePedia link the Sun Tour crank is already a 52/42/30 triple. A compact double (50/34) wouldn't even provide as low a gear as the OP has now.
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Old 07-12-14, 05:19 PM
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Originally Posted by HillRider View Post
According to the BikePedia link the Sun Tour crank is already a 52/42/30 triple. A compact double (50/34) wouldn't even provide as low a gear as the OP has now.
Heck I'd stay with a triple too. I don't think I've seen a suntour superbe triple before (the OP did say that his wife's bike had a suntour superbe crankset and she wanted lower gearing). Bikepedia lists a triple crank so who knows what the OP has.
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Old 07-12-14, 05:38 PM
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Consider this one as well:
Product Description | Origin8
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Old 07-12-14, 05:44 PM
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I've put a MB triple on an old hybrid. Went from 48/38/28 to 42/32/22 The rear cassette was already at the RD limit of 28. This made a huge difference for climbing. I had to lower the FD to match and I also had to change the bottom bracket to match the new crankset. Also will need to shorten the chain. Things I don't know about your situation are:

Will the FD designed for big rings work well on a MB ring set? Can you lower the FD( clamp on) or not (attached to a stud of some sort)? Will the chain clear the chainstay when in the lowest gear. Maybe someone here can answer these questions.

The big question would be, is she comfortable with the bike otherwise and not likely to part with it? It may be better and easier and less expensive to sell this one and get a more appropriate bike.
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Old 07-12-14, 05:44 PM
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You can use a lower end MB RDER such as Altus or Acera and it'll work fine. (I have an Altus shifting 9 speed without problem, so 8 should be more forgiving)

A cassette such as this, relatively inexpensive- (I'd go to the 12T small cog version
Amazon.com : Sunrace CSM66 8-Speed Nickel Plated Cassette : Bike Cassettes And Freewheels : Sports & Outdoors

And a longer chain will set you up.
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Old 07-12-14, 06:19 PM
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Originally Posted by Bill Kapaun View Post
You can use a lower end MB RDER such as Altus or Acera and it'll work fine. (I have an Altus shifting 9 speed without problem, so 8 should be more forgiving)

A cassette such as this, relatively inexpensive- (I'd go to the 12T small cog version
Amazon.com : Sunrace CSM66 8-Speed Nickel Plated Cassette : Bike Cassettes And Freewheels : Sports & Outdoors

And a longer chain will set you up.
This is the best overall suggestion so far. Chains and cassettes wear out anyway, so the only real expense is the derailleur
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Old 07-12-14, 07:07 PM
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Good advice folks. I appreciate it. And yes the wife's bike is the triple as the bikepedia site mentioned in the specs.

The cassette is probably a good idea. One other item I may try is replacing the alloy fork with a carbon fork.
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Old 07-12-14, 08:44 PM
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Originally Posted by dwcleck View Post
Good advice folks. I appreciate it. And yes the wife's bike is the triple as the bikepedia site mentioned in the specs.

The cassette is probably a good idea. One other item I may try is replacing the alloy fork with a carbon fork.
How many $/lb. will that save/cost?
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Old 07-12-14, 09:00 PM
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You'll gain more from a 12-36 mega range cassette. You could swap the middle and granny chain rings to get more even spaced gearing between shifts but the other posters are correct changing to a new crankset is a waste of money.

How much do you want to lighten a bike? At a certain point, there are diminishing returns to it.
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Old 07-12-14, 10:03 PM
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I didn't have a goal weight savings. Was just trying to do some reasonable things to improve the bike.

I don't know how much the current alloy fork weighs but a carbon should cause a weight savings plus a better ride. The only thing is I'm not sure if a fork change is that diy. I can find one that fits 1 1/8 inch for sub$100
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Old 07-13-14, 05:36 AM
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An inexpensive carbon fork will have an alloy steer tube and would probably not save any weight. There also might not be much if any improvement in ride quality. A set of better tires could have more effect on both ride and weight than a low end fork
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Old 07-13-14, 07:26 AM
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change the chainrings.. though volume of sales make whole cranksets cheaper , for factories that assemble new bikes ..
but You have to to choose the tooth count , in addition to the crank ..

Smallest if bolt circle is 74mm its 24t, 58 it's 20t

Middle & compact double if 110bcd its 34t
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Old 07-13-14, 07:33 AM
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After reading these threads, I'm not so sure if any of these suggestions get at what the OP wants/needs. It's easy to complain about this or that about a bike.

The bike the OP has is fine. It is reasonably light weight. It has wide ranging gearing.

It sounds more as if the OP's spouse may (a) not be comfortable on the bike in which case a proper bike fitting may be in order or (b) is just not that much into it in which case all these changes are not going to do any good.
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Old 07-13-14, 08:28 AM
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Overall her bike seems quite heavy. I like the simpler suggestions of better tires, and maybe a cassette with a few more teeth. Maybe for kicks a carbon seat post.

It is a 10 year old bike but kept inside and prob only 4000 miles on it.

She has decided not to do anything more to the bike than maybe the cassette if that, new tires - maybe lighter, and maybe an inexpensive carbon seat post. Heck, I may get one of those also

Any need at this age and miles to do any mechanical maintenance on her bike? I'm overwhelmed by the amount of advice and appreciate it. The bike does fit her ok. I did have to adjust the seat forward and turned the handle bars up a smidge. They were too far down. My cannondale came with the bars up a bit more and she wanted the same for a slightly more upright position.

Thanks all
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Old 07-13-14, 09:05 AM
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dwcleck, I used this crank set for a replacement on my beater bike: Universal Cycles -- Sugino Impel 150x Cranksets . This will lower gearing more so than the Shimano crank set you listed and while I have mine on a 110 mm BB spindle, it's rated for a 113-115 mm spindle and it works with indexed STI.

I have a Shimano LX RD, but try the current RD before changing.

Brad

PS Don't worry too much about shedding weight from the bike. Once you add a rider's weight to the equation, the percentage of difference even a couple of pounds removed from the bike makes isn't worth it for a recreational cyclist.

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Old 10-19-14, 06:22 PM
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i am looking at breaking town one of these bikes. not sure the BB type, or what kind of crank puller i would need to buy.

any advice appreciated
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