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Old 05-19-09, 05:12 PM   #1
hero419
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chainring BC size

Giant Cypress


Anybody know what the second (middle) chain ring bolt circle and # of bolts is?

Thanks
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Old 05-19-09, 05:16 PM   #2
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You sayin' you can't count up to five? Or jus' missin' a few fingers?
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Old 05-19-09, 05:20 PM   #3
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Nice,

A friend of mine stopped by on a bike ride and asked me to take a quick look. His chain was slipping under load in second gear. I noticed the teeth were worn.
I counted the teeth but did not find any info on the bolt circle. I figured it was standard but when I looked them up I found many options.

Needless to say, the bike is not here right now.

So if anybody has any info.....
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Old 05-19-09, 05:24 PM   #4
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I'm afraid it's a little too broad to answer. Giant's been making a Cypress in some form or another since 1998, and the spec has changed over time. If you had a year and type of crank, it would narrow it down considerably.
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Old 05-19-09, 05:25 PM   #5
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Originally Posted by Bob Barker View Post
You sayin' you can't count up to five? Or jus' missin' a few fingers?
From the pictures on the Giant web site, you only need to count to four. The crank is a no-name 4-bolt geared 28/38/48 so I expect the BCD is 104/64.

Better contact Giant first if you are trying to buy replacements as that's only an estimate.
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Old 05-19-09, 06:04 PM   #6
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how many teeth on the rings?
how many bolts? 4? 5?
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Old 05-19-09, 06:32 PM   #7
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42 teeth
not sure of bolts.
I noticed he had a 53 or bigger on the big ring so maybe it not stock.

Thanks for the help, I'll just have to measure it next time he is around.
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Old 05-19-09, 08:19 PM   #8
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Most modern chainring teeth are not uniform in shape or length. The special shapes aid in quick smooth shifting. These are often mistaken as worn teeth. Compare with some new bike chainrings.

Al
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Old 05-19-09, 08:36 PM   #9
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Most modern chainring teeth are not uniform in shape or length. The special shapes aid in quick smooth shifting. These are often mistaken as worn teeth. Compare with some new bike chainrings.

Al
Hi, Al-

+1.

My first MTB and experience with ramped and relieved-tooth chainrings was back in '93. I was SURE that I needed to take the bike back to get the rings replaced.
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Old 05-20-09, 10:04 AM   #10
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I understand the geomety, but this was the only chainring that had not been replaced in the last 15-20,000 miles.
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Old 05-20-09, 10:15 AM   #11
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I'd be very surprised if the chainring was the cause of the skipping. Those teeth would have to be broken/damaged, not worn, to cause the chain to slip. Most likely, your friend uses a particular cog on the cassette when in the middle ring and a different cog when using the big ring. You will get slipping when the cogs on the cassette are worn, which also means the chain is worn and needs replacing too.
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Old 05-20-09, 10:17 AM   #12
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New cassette
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Old 05-20-09, 05:24 PM   #13
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The other issue is whether the Cypress is low enough in the line to have a riveted crank.
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