Compact frames - Are they all like mine?
- Marv
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Compact frames - Are they all like mine?
Postby Marv » Thu Apr 26, 2007 5:36 pm
Just curious about my frame.
My last bike would stay staright when I took my hands off the handle bars.
My new Compact is as controllable as a goldfish on a lead.
I know I should have at least one hand on the bar to ride safely but I was just wondering if this is common for compacts?
The reason is yesterday I took my jacket off while riding and it was not as easy as I would have liked.
While we are at it, Anyone have some general likes/dislikes of compacts in general.
Cheers.
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Postby mikesbytes » Thu Apr 26, 2007 5:57 pm
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Postby europa » Thu Apr 26, 2007 7:12 pm
A very steep steering angle and/or small trail will produce a bike that is more responsive and I understand that time trial bikes tend to be set up so they are very nervous - this can result in a bike that is difficult to ride hands free.
However, a compact frame is simply one where the top tube slopes downwards this producing a middle triangle that is more compact than a traditional bike - it doesn't affect the handling at all.
I reckon the problem is more likely to be your technique though - I have days when I can stretch and ride for quite long distances hands free, and others where loosening the grip has me visiting the roses
Richard
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Postby Marv » Thu Apr 26, 2007 7:31 pm
After adjusting my saddle height using the Le-Mond method,
which only increased it 2 mm above where I naturally had it from feel and sight, the top of the seat is 12cm above the top of the handle bars OMGosh
My last ride was 5cm and felt good
I have a great suspicion that the bike shop guys were wrong when they told me it was my size bike.
The bar stem is already set to the top of the steerer tube.
The Frame is a compact and has 48.5cm stickered on the tubes.
When I found what this measures to, it is from the middle of the cranks to the top of the seat tube of the frame.
I am 5'10" and I think my frame size is 54cm.
I asked if it was too small and was told its a compact and was my size.
Waddya 'all reckon please.
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Postby Bnej » Thu Apr 26, 2007 7:59 pm
I'd previously had some problems with my wrists which I explained to the LBS, and they have me set up with the bars about the level with the seat.
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Postby mikesbytes » Thu Apr 26, 2007 8:05 pm
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- Marv
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Postby europa » Thu Apr 26, 2007 8:42 pm
Stupidly high seats are all part of modern bikes, especially if you are used to more traditional setups. Get the seat where you want it, make sure enough of it is still in the frame (there'll be a mark on the seat post) and just accept it. The next test is the reach to the bars - are you too stretched out? This is a feel thing and while there are all sorts of formulae and tests, like everything with bike fit, eventually it comes back to what feels right. You don't want to feel cramped, nor overly stretched. Weight on the hands? Mate, with a riding position like that, you'll have a ton of weight on your hands, but you can still mess with the seat to see how things pan out ... if you wind up with the seat too far back or too far forward, you can adjust that with neck length and then return your seat to a more efficient position over the pedals.
Forget numbers, just do what's needed to feel 'right' on that bike. If you wind up with a monster like my Sow's Ear, then you'll know for sure you've got a frame that's the wrong size. Don't forget, your physical size might put you at the change over between two frame sizes and that may make things look a bit weird, but I don't think your seat is overly far out of the frame.
Richard
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Postby Marv » Thu Apr 26, 2007 9:00 pm
ATM the seat pole is on the 1. At zero is minum insert and the scale goes to 10 or so.
Maybe I am in that awkward zone although I thought my height is pretty common.
I think I am a bit scared that a neck piece to fix the handle bar position will leave me with a bike that looks like a hybrid.
I will definatley go in tomorrow and ask a few questions.
I hope it is as simple as a new neck stem but a 7cm rise seems a lot.
We'll see, I'll try not to lose any sleep over it just yet.
There is a bit of money in that bike and I have my fingers crossed.
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Postby timbo » Thu Apr 26, 2007 10:34 pm
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Postby MichaelB » Fri Apr 27, 2007 9:16 am
One of the key measurement given by guys on this forum was the "approx 50mm between top tube and the important bits when standing with feet flat on the ground"
I have that with my bike, but could probably go to a 57cm frame if need be.
At the end of the day, you need to fit well. Maybe get a bike fit done somewhere else to confirm it ?
On the Sheldon Brown website, there is an interesting article written by Keith Bontrager about the myth and inaccuracy of the common method of Biek Fit (known as KOPS - Knee over Pedal Spindle), and whilst it doesn't give you the data to work it out, it is an interesting read
The myth of KOPS
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Postby mikesbytes » Fri Apr 27, 2007 10:41 am
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Postby Marv » Fri Apr 27, 2007 7:46 pm
I did see though that Giant Mediums are a 50cm compact whereas the Azzurri was a 48.5cm.
Anyway did ya pickup on the 'was'?
I went back today and the owner happily let me walk out the door with a New Large version (52.5cm) compact with full Ultegra groupset for only an extra $300.
Both of these bikes were without wheels as I already had a new set of 105 wheels with my trusty gatorskins.
I have done a setup to where I feel comfortable and all is very well.
I have the neck stem halfway on the steerer so there is room up and down if changes need to be made.
I already feel very comfortable.
The seat post is not sticking a mile out.
The original picture of the Primo in the link above is very much how the medium was set to fit my legs.
This setup looks much more civilised.
Thanks all for the encourage and reassurance that the frame may indeed be a bit small for me.
The seat to bar drop is now sitting on a comfortable 6cm with potential to be moved at will without a stem change.
Out of interest I didn't feel a great deal of difference between a Sora and 105 group.
This Ultegra is a whole new league for sure.
Definatley worth the extra scratch.
Rock'n'Roll.
- Marv
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Postby Marv » Fri Apr 27, 2007 9:13 pm
You can borrow it any time mate, I trust ya
I feel so much better knowing I have a bike that has plenty of room in every direction to make adjustments.
Even the saddle (fore/aft) is sitting in the middle of the adjustment scale with my seat tip to bar length right on the money at the same time my KOC being inline.
All good. It's like everything fell into place at the same time.
It even rides hands free a whole lot better.
Maybe the extreme seat pole lenght before was not good for the centre of gravity
Cheers Team and happy hill climbing.
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Postby Mulger bill » Sat Apr 28, 2007 9:36 pm
Strange about that funny blue colour, a bit of Googling told me that there was this large supply of military surplus paint going around onceeuropa wrote:Only if it's that funny blue colourpospete wrote:So with one of these Compact bikes do you get a little mirror and a lip pencil?
Richard
it's open season on Bianchi, next month we pick on Trek
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Postby mikesbytes » Sat Apr 28, 2007 10:28 pm
Is it a red or pink bike ?pospete wrote:So with one of these Compact bikes do you get a little mirror and a lip pencil?
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Frame Size Calculator.....Park Tools Repair Guides Frame Size Calculator.....Rolling Resistance.....Rolling Performance.....Sheldon Brown's Bicycle Technical Info
training log.....Body-Mass Index, Waist-to-Height Ratio, Basal Metaboic Rate
Bicycle FAQs.....Bicycle Safety.....Cadence in Cycling.....Types of Bicycles
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