Author Topic: Guru DFU (Dynamic Fitting Unit) bike fit  (Read 8514 times)

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Offline Herbie53

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Guru DFU (Dynamic Fitting Unit) bike fit
« on: December 20, 2011, 11:18:54 PM »
About a month or so ago I had a fitting on the Guru Dynamic Fit Unit at Parvilla Cycles  http://parvillacycles.com/.  I had not had a professional fit (unless you count what they do when they sell you a bike at Performance) for a very long time.



The process as I recall it is like this.....

Before getting on the DFU
  • static measurements of my current bike were taken and entered into the DFU
  • static measurements of me were taken (inseam, arms, torso, height, shoulders, etc.)
  • flexibility was assessed (current bike set up and some stretches)
  • review of any issues (numbness in hands or elsewhere :o , what gets sore first, asymmetry)
On the DFU
  • Some on the bike before measurements (current fit) are taken to capture angles and KOPS numbers and cleat position
  • Next is a warm up (still current fit) while the Computrainer measures your numbers and displays a "Spinscan" (this http://www.racermateinc.com/spinscan.asp)
  • Once warmed up a brief power test is run (mine was to go up a simulated hill and hold a steady speed) and the Spinscan, power and HR results are recorded as a baseline.
  • Then the fun starts... the fitter (Stu at Parvilla) starts moving the seat and bars in any direction.  Much as with a static fit the direction is based on what the fitter knows and believes to be optimal... but there is a difference.
  • Besides staring at the Computrainer screen you get to see yourself on video.  I found this helpful to see how my position changed my posture on the bike (arms bent back flat sort of stuff).
  • As the fit changes you continue pedaling and besides perhaps feeling better, the Computrainer will pick up improvements in your pedal stroke.
  • Finally, after getting things to an optimal position another power test with the same parameters was run and the Spinscan, power and HR numbers recorded.
So what was mine.....

Apparently my it feels better to raise the seat a little bit so raise it a little more strategy over the last couple of years was flawed.  Here are some of my before and DFU optimal measurements in mm. 

Seat Height (SH) Before 835 DFU 801
Saddle Set Back Before 80 DFU 95
Reach (R) Before 590 DFU 570
Seat to Handlebar Drop (STH) Before 110 DFU 109

My spin scan before was 74 and after was 81.  The power during the fitting was the same, but the PE was lower with the new fit.  It was enlightening when Stu pushed a button that moved me quickly from the new fit back to the old... it felt odd and awful.

What made me want to write this review was the power I am seeing 30 days later from a 20 minute FTP test.  ~22Watts more .... and my November/early December workouts have been mostly tempo / endurance and some wheel sucking team rides.  I believe I am also seeing lower heart rate numbers for a given effort (I suppose that goes with more ftp).  Generally I feel a lot better on the bike.

This thing works.
« Last Edit: December 20, 2011, 11:43:14 PM by Herbie53 »
Sadly this is bike racing and not everyone gets a pony.

Offline LAJ

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #1 on: December 20, 2011, 11:28:14 PM »
Thanks Herbie! One of our club sponsor shops has that gizmo, and I was curious as to how it worked. Thanks for the review.
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Offline MidgetMaestro

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #2 on: December 21, 2011, 12:01:00 AM »
Could you share what the approximate cost was (unless it was a team benefit/discount services .etc)?

Offline Herbie53

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #3 on: December 21, 2011, 12:05:39 AM »
Could you share what the approximate cost was (unless it was a team benefit/discount services .etc)?


Here is the the retail pricing from Parvilla ($300) http://parvillacycles.com/about/dfu-powerfitte-road-pg113.htm

... and hey look the description pretty much matches what my old fart brain remembered!
Sadly this is bike racing and not everyone gets a pony.

shovelhd

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #4 on: December 21, 2011, 08:17:48 AM »
Very interesting. Good to know. Thanks for your review.

Quel

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #5 on: December 22, 2011, 11:16:42 AM »
Interesting.  I may have to try that place out some time.  I'm all self fitted and really don't have much adjustability to my bike right now, but a new frameset may be in my future purchases (maybe not till 2013).  So it'd be nice to know what I actually need, vs how I have myself fit based on what I have.

I had dinner with a bunch of triathletes last night.  I was surprised that nearly all of them have had expensive bike fits done.  Business must be good for those guys.
« Last Edit: December 22, 2011, 11:20:39 AM by Quel »

shovelhd

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #6 on: December 22, 2011, 11:44:40 AM »
I had dinner with a bunch of triathletes last night.  I was surprised that nearly all of them have had expensive bike fits done.  Business must be good for those guys.

Did you all eat slowly and methodically and at the same pace?

I've gotten so may great deals on bike stuff from triathletes and coaches that I've lost count. They're always upgrading, and I'm benefiting from their castoffs.

Quel

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #7 on: December 22, 2011, 11:50:53 AM »
They were all pretty steady.  I asked myself "what would shovelhd do?", so I went off the front in the beer drinking competition.  They didn't know how to react to that change in pace.

shovelhd

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #8 on: December 22, 2011, 11:53:11 AM »
Now there ya go. Nice work.

Offline Herbie53

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #9 on: December 22, 2011, 09:22:36 PM »
Interesting.  I may have to try that place out some time.  I'm all self fitted and really don't have much adjustability to my bike right now, but a new frameset may be in my future purchases (maybe not till 2013).  So it'd be nice to know what I actually need, vs how I have myself fit based on what I have.

I had dinner with a bunch of triathletes last night.  I was surprised that nearly all of them have had expensive bike fits done.  Business must be good for those guys.


There's a short group ride out there on Boxing Day (Monday the 26th) at 10:30A.  30 miles, no drop... you'll fit right in. :P   You should go and check it out.

There is a lot of TT bike eye candy at the store right now.
Sadly this is bike racing and not everyone gets a pony.

Quel

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #10 on: December 23, 2011, 11:14:07 AM »
Going up to Massachusetts to visit my parents for a few days...won't be back until Monday night probably.  If there's another ride going on some time that week I'll drop by though.  I'm off all week.

shovelhd

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #11 on: December 23, 2011, 12:14:21 PM »
Did you bring the bike to MA? We're doing an early ride tomorrow.

Quel

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #12 on: December 23, 2011, 03:44:52 PM »
No can do unfortunately.  Leaving tomorrow morning and driving.  Have family stuff all Saturday afternoon/Sunday, then probably headed back Monday.  So no bike time for me.  Near Worcester Saturday (Dudley), and Newburyport Sunday, so on the other side of the state from you.

Offline Herbie53

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #13 on: December 23, 2011, 03:58:11 PM »
New DFU video from Parvilla.


Sadly this is bike racing and not everyone gets a pony.

shovelhd

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Re: Guru DFU (Dynamic Fitting Unit) bike fit
« Reply #14 on: December 23, 2011, 07:32:11 PM »
Maybe next time, Quel. I'm about an hour from Dudley/Webster. I bought my first house on Oxford and my second in West Millbury before we moved out here.