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Road Cycling It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle. -- Ernest Hemingway

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Old 01-08-14, 09:49 PM   #1
JasonCarp
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need bottom bracket/crankset help

I am lost, and may be in over my head. I have a 2008 Specialized Roubaix Expert Rival Compact. I am due for an new cassette/chain and chainring. I figured I would save a few bucks and order the parts online. I wrote down the exact model number, and all info off the crankset, and ordered what I thought was the best deal from Jensen USA.

This is what I ordered: http://www.jensonusa.com/Sram-Rival-...k-175mm-34X50T

Received it today and this is what it looks like: http://www.backcountry.com/sram-riva...NDExMDAwMDEzNA

Are there two versions of a SRAM Rival compact crankset? Or is my older version less open? I am not a total weight weenie, but this thing looks heavy compared to what I own now.

I apparently need a bottom bracket lesson too. Specialized has several published bulletins stating that a 42mm alloy OSBB Shell is what the bottom bracket is supposed to be. The bottom bracket that came with this says GXP on it just like the crank arm (new one and existing) but does not look like what is on the bike right now? Do I need to order a different bottom bracket.

I am pretty competent with truing wheels, chains, cassettes, tires, stems, but I have never done a BB before. From the videos on line, it looks fairly easy, but I just want to make sure I have all the right stuff before I start.

Thanks in advance.
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Old 01-08-14, 10:41 PM   #2
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Quote:
Originally Posted by JasonCarp View Post
I am lost, and may be in over my head. I have a 2008 Specialized Roubaix Expert Rival Compact. I am due for an new cassette/chain and chainring. I figured I would save a few bucks and order the parts online. I wrote down the exact model number, and all info off the crankset, and ordered what I thought was the best deal from Jensen USA.

This is what I ordered: http://www.jensonusa.com/Sram-Rival-...k-175mm-34X50T

Received it today and this is what it looks like: http://www.backcountry.com/sram-riva...NDExMDAwMDEzNA

Are there two versions of a SRAM Rival compact crankset? Or is my older version less open? I am not a total weight weenie, but this thing looks heavy compared to what I own now.

I apparently need a bottom bracket lesson too. Specialized has several published bulletins stating that a 42mm alloy OSBB Shell is what the bottom bracket is supposed to be. The bottom bracket that came with this says GXP on it just like the crank arm (new one and existing) but does not look like what is on the bike right now? Do I need to order a different bottom bracket.

I am pretty competent with truing wheels, chains, cassettes, tires, stems, but I have never done a BB before. From the videos on line, it looks fairly easy, but I just want to make sure I have all the right stuff before I start.

Thanks in advance.
OSBB is Specialized's version of BB30. Is your current BB carbon or alloy shell? Depending on that you have you are going to need either a PF30 (carbon) or BB30 (alloy) adapter.

BB30 adapter - http://wheelsmfg.com/bb-30-shims-sram.html
PF30 adapter - http://wheelsmfg.com/pressfit-30-ada...am-cranks.html

To make your life easier what you would need is a BB30 crank and BB.

Last edited by gus6464; 01-08-14 at 10:50 PM.
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Old 01-08-14, 11:05 PM   #3
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The Rival crankset you ordered will work exactly the same as your older one. The chainrings on the newer Rival crankset looks like the chainrings found on their Red crankset, pre-2013.

My cousin used to have the same bike, and the bottom bracket is a typical Sram GXP (68mm/BSA) threaded bottom bracket.
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Old 01-08-14, 11:25 PM   #4
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This your bike?
http://www.specialized.com/us/en/bik...actrival#specs

If it is you have an english BB so regular GXP will work.
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Old 01-08-14, 11:55 PM   #5
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i'm wondering why, if the OP was "due for an new cassette/chain and chainring", why the new crankarms,bolts and BB? aren't standalone chainrings available for Rival cranks? or have i fallen behind the times, as regards all things crankish ?...

a not so inquiring mind, i guess, wants to know.

Last edited by hueyhoolihan; 01-09-14 at 12:01 AM.
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Old 01-09-14, 12:39 AM   #6
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Gus, yes that is my bike.
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Old 01-09-14, 12:42 AM   #7
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Huey, a couple reasons. One, I could only find black, and my current set up is all silver. Second, BB has neve been replaced, and thought it was time to do that as well.
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Old 01-09-14, 03:30 AM   #8
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fair enough.

i should talk! i can see two or three unmounted BB's and four or five chainrings on the shelf across the room, that will probably never be mounted again...

i don't even know why i asked. good luck.
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Old 01-09-14, 05:03 AM   #9
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I would say you got a good deal, the current version of the crankset at the price of a discounted old model, online specs show both weight the same.
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Old 01-09-14, 06:23 AM   #10
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Although you could have upgraded to say new Sram Force GXP...You bought the correct crank for your bike and if you have the original 2008 BB, I would install a new BB along with your new crank.
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Old 01-09-14, 07:55 AM   #11
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Are you really sure you need new chainrings? They last a long time.

And if you do and want new then ebay is your friend:

http://www.ebay.com/itm/Sram-Inner-F...item3a86ca4f92

http://www.ebay.com/itm/Sram-FORCE-5...item46183431f4

There are also a few auctions for people selling take off or slightly used pairs of silver 34/50 rings. And as I said, rings last a long time.

The new version of a GXP BB looks a little smoother than the old but is compatible with your existing crank:

http://www.ebay.com/itm/New-Truvativ...item4acea67c98
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