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Old 09-26-10, 03:35 AM   #1
hollowman
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Need Shimano Hyperdrive-C, 38T middle chain-ring

I have a 1993 Gary Fisher Advance Mountain Bike. It came with a Shimano Hyperdrive-C crankset (Shimano Altus C10, 28/38/48 teeth). I need to replace the middle chain-ring (38T). It is mounted with 5 bolts. Can someone please point me to a source (pref. product/part page link) where I can order this chain-ring?
Thx!
BTW: Is there a heavier-duty version of this chain-ring avail.?
Here's a pic of the crankset on my GF:

Last edited by hollowman; 09-26-10 at 03:55 AM.
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Old 09-26-10, 03:49 AM   #2
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Those chainrings look like they are not replacable. (The current Altus cranks no not have replacable chainrings.) To get replacable chainrings you will need to uprgade to at least Acera.
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Old 09-26-10, 04:09 AM   #3
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BB size, modern replacement also needed

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Originally Posted by Bezalel View Post
Those chainrings look like they are not replacable. (The current Altus cranks no not have replacable chainrings.) To get replacable chainrings you will need to uprgade to at least Acera.
Thx for your reply.
Can you/anyone suggest a crankset for this bike+BB combo (dunno BB specifics). I don't necess. need a compact crankset (i.e. Hyperdrive C), as on the stock GF bike (shown above). I would like one with a heavier-duty chain-ring set, if possible.
BTW: Why not Alivio crankset? The other stock components on the 1993 GF bike are Aliv
BTW2: Can anyone clue me in on this bike's BB size, and modern (suggested) replacement?
BIG THX!

Last edited by hollowman; 09-26-10 at 04:52 AM.
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Old 09-26-10, 08:32 AM   #4
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I believe Bazelal is correct that these chainrings are riveted (not bolted) to the crank arm and are not replacable so you will need a complete new crank. Also, IIRC, these chainrings are steel, not aluminum, and therefore are the most "heavy duty" you can get.
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Old 09-26-10, 02:28 PM   #5
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Originally Posted by HillRider View Post
I believe Bazelal is correct that these chainrings are riveted (not bolted) to the crank arm and are not replacable so you will need a complete new crank. Also, IIRC, these chainrings are steel, not aluminum, and therefore are the most "heavy duty" you can get.
So a whole crankset it is ... (I really have no choice: the middle CR is missing several teeth, and inner and outer have a few missing as well). Okay, so say I can't find a used OEM off eBay ... and since I'm no loger using the GF as a Mntn Bike (but as a Utility or Hybrid bicycle instead) ... what are the best NEW options? How about these:

Sugino Impel Triple Crankset
$41.25
or how about...

FSA Dynadrive SQ Taper C-Set Crankset
$50.00

Hint: I want to remain a cheapskate with the replacement crankset
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File Type: jpg cr407a27sil__150__&#.jpg (49.7 KB, 5 views)
File Type: jpg cr407a27sil__150__&#.jpg (5.1 KB, 4 views)
File Type: jpg cr307a06eng__175__&#.jpg (59.0 KB, 5 views)

Last edited by hollowman; 09-26-10 at 02:35 PM.
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Old 09-26-10, 03:09 PM   #6
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If you get a new crankset, make sure that the existing BB spindle is the correct length, or get a new bottom bracket.
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Old 09-26-10, 05:18 PM   #7
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Quote:
Originally Posted by hollowman View Post
So a whole crankset it is ... (I really have no choice: the middle CR is missing several teeth, and inner and outer have a few missing as well).
Well, before you go any further, is the current crank giving you shifting or skipping problems? I ask because most newer cranks (post about 1990 or so) have "shaped" teeth to assist shifting and, if you don't know what you are looking for, they can seem broken or badly worn.

So, unless the old crank is causing noticable problems, it may be perfectly fine. I.e. If it ain't broke, don't replace it.
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Old 09-26-10, 07:06 PM   #8
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Quote:
Originally Posted by mikeshoup View Post
If you get a new crankset, make sure that the existing BB spindle is the correct length, or get a new bottom bracket.
Yeah, I'm beginning to see that (via user/customer comments on the product pages). I wish every crankset manuf. stated this in their specs/product description. FSA and Sugino don't seem to offer complete data.

Last edited by hollowman; 09-26-10 at 11:31 PM.
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Old 10-01-10, 07:34 AM   #9
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Hey, folks, what do you think of this crankset for replacement:



FSA DynaDrive Crankset: Sqaure Taper, 175mm, 22-32-44, Black.
Size: 175mm
Style: Mountain
Color: Black
Weight: 945g
BB Thread Type: English
Spindle Interface Type: Square Taper JIS
Spindle Length: 113,110.5mm
Pedal Spindle: 9/16
Bolt Pattern: 4-Bolt
Chainring BCD: 104mm
Arm Length: 175mm
Rings: 22-32-44
Crank-FD Type: Mountain Triple
Crank Intended Use: Mountain
Chain Compatibility: 9-Speed

Can anyone with experience with this model and/or brand of crankset (FSA) comment on its quality, durability and/or reliability?
Thx!
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Last edited by hollowman; 10-01-10 at 07:41 AM.
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Old 10-01-10, 08:46 AM   #10
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What are you using the bike for?
That crankset has smaller rings than your current cranks, using that will effectively lower your entire gearing range.
If your chainrings are worn, in what condition are you chain and cassette? They will wear past usability much faster than chainrings.
But, before you go dropping cash, you should read Hillrider's post above. I thought the exact same thing when reading your description of the state of your current rings.
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Old 10-01-10, 10:14 AM   #11
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OLD chain has to go, step 1.
you may need a new cassette and perhaps, chainrings, if you let it go way too long.
replace all 3 and you can start afresh.

I get long wear out of steel chainrings, myself. with regular replacement of the chain.
given the wheel rotates multiple times, for every one of the pedals ,
cogs on back wear faster than those on the front.
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Old 10-01-10, 06:39 PM   #12
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Quote:
Originally Posted by Steev View Post
What are you using the bike for?
That crankset has smaller rings than your current cranks, using that will effectively lower your entire gearing range.
If your chainrings are worn, in what condition are you chain and cassette? They will wear past usability much faster than chainrings.
But, before you go dropping cash, you should read Hillrider's post above. I thought the exact same thing when reading your description of the state of your current rings.
Bike used as util..(see image below) I ride very gently, and all on-road. I don't need bike to go fast.
Cassette is Shimano HG70 7-spd. Current chain, which I replace every 6mos, is Shimano HG91. FYI: Use Conti Top Touring tires and Sun Rhyno Lite rims. Deore hubs. Deore XT rear derail.
As I stated above, the middle CR is missing teeth (at least 6 as of last count). Yes, I have shifting (and skipping / jumping) problems, despite critically aligning gears when chain is new. And, of course (given age and use), all CRs are worn.


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Last edited by hollowman; 10-01-10 at 06:46 PM.
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Old 10-01-10, 06:42 PM   #13
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Quote:
Originally Posted by fietsbob View Post
OLD chain has to go, step 1.
you may need a new cassette and perhaps, chainrings, if you let it go way too long.
replace all 3 and you can start afresh.

I get long wear out of steel chainrings, myself. with regular replacement of the chain.
given the wheel rotates multiple times, for every one of the pedals ,
cogs on back wear faster than those on the front.
fietsbob: Cassette is Shimano HG70 7-spd. (in good cond and not very old). Current chain, which I replace every 6mos, is Shimano HG91.
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