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Old 09-15-11, 06:13 PM   #1
johnny0723
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Giant Rapid 2 and Sirius comp

sorry to do this...need some advice 2011 rapid 2 appears to be where I'm going but no bike shop around me has a 2012 Sirius comp for me to look at or try. Can I hear your thoughts between these 2? l like the speed and light weight of the rapid. Can the the Sirius compare? I really want go see what the tired look like on the Sirius but no luck. One bad thing about the rapid was the weak brakes. Would it cost a lot to upgrade to something decent?

any help appreciated

thanks
john
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Old 09-16-11, 02:06 PM   #2
RollCNY
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For an all on road bike, the Giant Rapid looks like the better package. What is the brake concern? Lots of folks just switch out pads to Kool Stop Salmons, and talk them up. Sirrus is mtb components, and has a mtb double crank. The Rapid has road components, and possibly a higher geared top end.

I own a Sirrus and love SRAM shifters, but would buy the Giant in this specific comparison.
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Old 09-16-11, 07:47 PM   #3
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Originally Posted by RollCNY View Post
For an all on road bike, the Giant Rapid looks like the better package. What is the brake concern? Lots of folks just switch out pads to Kool Stop Salmons, and talk them up. Sirrus is mtb components, and has a mtb double crank. The Rapid has road components, and possibly a higher geared top end.

I own a Sirrus and love SRAM shifters, but would buy the Giant in this specific comparison.
Thanks for the feedback. I definitely prefer the road bike components over the mtb. This may have made up my mind. As for brakes they were just really weak. May be it needs to be broken in.
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Old 09-22-11, 09:12 PM   #4
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Originally Posted by RollCNY View Post
Sirrus is mtb components, and has a mtb double crank. The Rapid has road components, and possibly a higher geared top end.
So, stupid newbie question but what's the difference between mountain bike components and road components?

Thanks!
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Old 09-23-11, 05:10 AM   #5
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Differences aren't necessarily huge:

MTB cranksets tend to favor triples, and seem to top out at 44, 46, or 48 tooth big ring. Roads have triples, but compact double is common, as is road standard, which means 50, 52, or 53 tooth big ring.

Front derailleurs have different cable pulls mtb vs road, and slightly different shapes to accomodate front ring size.

MTB cassettes have bigger range usually than road, so you might see a 12-36 mtb cassette where a road might top out at 12-28. Bigger range means bigger jump between gear shifts. These parts are interchangeable road vs mtn, the big thing is making sure that your rear derailleur can handle the range.

Road rear derailleurs tend to have shorter arms and are lighter weight than MTB. They are set up to cover a smaller cassette. MTB rear der's are designed for different things: mud clearance and getting smacked, so they seem to be beefier.

So with all of this, what you start with has some impact on your upgrade path, if you chose to upgrade. Stock bikes have the components that work together chosen so that they work. When you start upgrading, you have to stay with that scheme, or change enough to be compatible.

Example:
When I got my Sirrus, it had a MTB triple crank (48/38/28 teeth). I replaced that with a compact road (50/34 teeth) crank, and couldn't get it to shift well on the front, I think because the MTB front der had too steep of a curvature for the bigger crank, so it was hard to set the height and clearance correctly. But I couldn't just put on a road front der because road shifters vs mtb shifters have different cable pulls (they move a different amount of cable to actuate the der), so the curvature would be right but the movement wrong. I eventually, with the help of BF, found a road curvature mountain cable pull front der and it now shifts beautifully. Many bikes come stock with this set up, so there is no hassle figuring it out.

Hope this helps, and sorry I am wordy.
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Old 09-26-11, 08:33 AM   #6
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That was beautiful - thanks!
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