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About those who are high and rearward. So what? They’re pros. We’re not.
I’m not willing to give up that easily. I’d like to see more Slowtwitchers, and more fitters paid by Slowtwitchers, try a little harder to get us in the positions typical of the pros. Then, if it just can’t be, then fine. We tried.
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Let’s work with such an example.
We have 3 Slowtwitchers who are all very similar, and the numbers in parentheses are Pad X followed by Pad Y in millimeters. They are duckies (498/671) callin’ (499/676) and kcb203 (501/681). Pretty much the same bikes are indicated for each of these riders.
I have established a motif for this, where I pick a Game of Thrones cast member as a meme or proxy. Today it’s Brienne of Tarth (a knight in every way, except for gender). Now, my guess, each of the three Slowtwitchers are probably men. But Gwendoline Christie (who plays Brienne) is in real life 6’3”. If we can stipulate that she might be very slightly long of leg (versus torso), a Pad Y of 675mm and a Pad X of 500mm is not a bad set of metrics. I really do hope none of our 3 Slowtwitchers I’m singling out is shorter than 6’1” and I’m wishing more like 6’2” or hopefully 6’3”. In my mind’s eye that’s the height that nicely matches pad-center of 675mm and 500mm for Pad Y and X respectively.
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Quintana Roo PR6: It’s a 54cm. “No way!” you say. How can someone 6’3” ride a 54cm bike? Quintana Roo sizes its bikes by their frame stack. A size-54 has a frame stack of 54cm (or 540mm), same as a size-56 Felt IA, or a size-Large Speed Concept, or a Medium Dimond. It could have been a size-56cm PR6 except that bike’s integrated stem really wants a Pad X (to center) to be longer than 500mm. It’s a PR6, size 54m, all the rearward (pulled back) stem options, along with 15mm of stem spacers (part of the integrated stem) and 20mm of pad pedestals.
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Specialized Shiv: With a Pad height of 675mm atop a Pad length of 500mm we're in Shiv territory now. Taking the Expert as an example ($3,500 bike) it uses a pretty standard aerobar, roughly 60mm of pad height above the pursuit bar center, it takes a standard 15mm or so headset top cap, like the Ordu OMP it really doesn’t want headset spacers (cosmetically), but we don’t need them. Because it’s got a frame stack in size-L that’s 25mm taller than these other bikes we’re looking at, let’s slide a 90mm-long stem, -6° pitch, on there. Based on our own Slowtwitch calculators that are the heart of the F.I.S.T. System for fitting we end up needing a bike with a frame that has a stack of 564mm and a reach of 422mm. A Shiv in size-Large has a stack/reach of 565mm/425mm. So there’s your prescription. Got that?