New TT bike - BMC Time Machine TT02
09-08-11, 03:52 PM
#26
Peloton Shelter Dog
Thanks. I am only half the man you are so I only need half the gearing. On today's ride at 25 mph I still had about three gears left, I am going to have to get much stronger before I have to worry about a standard crankset.
Now if I had your money, I would probably go ahead and order a 54/39 Quarq for it.
Now if I had your money, I would probably go ahead and order a 54/39 Quarq for it.
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09-08-11, 03:53 PM
#27
Peloton Shelter Dog
Can't you put any chainrings on that Quark? I thought the Quark was in the crank arms, not the chainrings.
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09-08-11, 03:55 PM
#28
Throw the stick!!!!
Thread Starter
Does this idea make any sense to you? I am thinking about getting a Wheelbuilder disc cover. If I do that I may have it made to fit my PT wheel laced to a DT Swiss rim. Think that would work as well as having it made for my current wheelset? If I go that route I can just get a crankset. What do you think?
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09-08-11, 03:55 PM
#29
Throw the stick!!!!
Thread Starter
Makes sense, thanks.
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09-08-11, 04:18 PM
#30
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If that's a limiting factor in your TT, go for it. You need the gears. For most other TT's the 50t is as good or better for mortals.
09-08-11, 04:29 PM
#31
Peloton Shelter Dog
You're making my case for me. The bigger gearing can give you an extra couple of mph on the downgrades. Nothing wrong with that. Compacts are for makeup, not racing bicycles.
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09-08-11, 05:16 PM
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I'm making the case that you should have proper gearing, not that you should get a 54x11. Proper gearing depends on the situation. I'm not aware of a TT within a couple hours drive of here where I'd need to worry about going 42+ mph. So for the rest of the TT's, having a compact gives me an extra gear or two in the middle of the cassette to work with while staying in the big ring.
09-08-11, 05:45 PM
#35
Peloton Shelter Dog
I'm making the case that you should have proper gearing, not that you should get a 54x11. Proper gearing depends on the situation. I'm not aware of a TT within a couple hours drive of here where I'd need to worry about going 42+ mph. So for the rest of the TT's, having a compact gives me an extra gear or two in the middle of the cassette to work with while staying in the big ring.
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09-08-11, 05:45 PM
#36
Peloton Shelter Dog
Because they're so stiff and heavy that at least they have looks going for them.
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09-08-11, 06:05 PM
#37
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09-08-11, 06:36 PM
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Originally Posted by patentcad
and heavy that at least they have looks going for them.
09-08-11, 06:38 PM
#39
Throw the stick!!!!
Thread Starter
Mine's heavy. 
Of course it is built with heavy wheels, a heavy crankset, heavy bars, etc, etc.....
Of course it is built with heavy wheels, a heavy crankset, heavy bars, etc, etc.....
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09-12-11, 02:55 PM
#41
Its Freakin HammerTime!!!
LOL what the hell does that matter? heheheheheh
09-12-11, 04:01 PM
#42
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09-12-11, 04:29 PM
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This is why TT'ers will be happier to ride at a cadence of 80-90 and use their 53-11 instead of going to a higher cadence.
Nice bike, OP
09-12-11, 06:32 PM
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Sorry, I'm missing something. How does high cadence and high speeds slow you down? I agree that when i watch a TT normally you see the guys running a large gear with a lower cadence then you would normally thing is right during a race. I'm just not understanding the reasoning behind this.
09-12-11, 06:36 PM
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I am so glad I have always been a high gear, low cadence rider.....
now to become a high gear, high cadence rider >
now to become a high gear, high cadence rider >
09-12-11, 07:07 PM
#46
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Why do you say that? Go watch video of any of the top pro TTers and tell me their cadence. If you can find one with a cadence of 80 I'll eat my hat. I'd say Cancellara is north of 100.
09-12-11, 07:22 PM
#47
VeloSIRraptor
the issue is the BCD (bolt circle diameter) on a compact is 110, a standard crankset is 130.
Compact cranks don't (generally speaking) come larger than 50t, it is about the spacing of the bolts around the crankset that are the limiter, not the nature of the Quarq itself.
Compact cranks don't (generally speaking) come larger than 50t, it is about the spacing of the bolts around the crankset that are the limiter, not the nature of the Quarq itself.
09-13-11, 05:50 AM
#48
Throw the stick!!!!
Thread Starter
Thanks guys.
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09-13-11, 06:59 PM
#49
Throw the stick!!!!
Thread Starter
Here is the data from my first race on it.
https://app.strava.com/rides/1574628#24906420
15.18 miles
38:24 (minutes:seconds)
271 feet elevation gain
23.8 avg moving speed
291 watts avg (296 watts on WKO+)
311 nom watts
753 max watts
95 avg cadence
671 kilojoules
https://app.strava.com/rides/1574628#24906420
15.18 miles
38:24 (minutes:seconds)
271 feet elevation gain
23.8 avg moving speed
291 watts avg (296 watts on WKO+)
311 nom watts
753 max watts
95 avg cadence
671 kilojoules
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09-14-11, 01:24 AM
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Sorry, I'm missing something. How does high cadence and high speeds slow you down? I agree that when i watch a TT normally you see the guys running a large gear with a lower cadence then you would normally thing is right during a race. I'm just not understanding the reasoning behind this.
This is why TT'ers even use shoe covers to increase the aeroness of the feet.
The higher your cadence ... the faster your foot is "kicking against the wind" and so the more it will slow you down.
The difference isn't huge nor is it even big ... but for time trial races it can mean the difference between winning and not even being near the podium since the effect increases exponentially with speed increase.