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Old 09-25-10, 06:00 PM   #1
nivekdodge
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Bike fit for all Bikes?

My wife is doing good with Jenny Craig and we went for a MUP ride tonight and she said the bike feels very different. I know all the ins and out on fitting a road bike. Is her Diamondback Parkway from the early 90's under most of the same rules? Such as (I know this is controversial but) her knee is maybe an inch too far over the spindle.

Thanks
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Old 09-25-10, 06:33 PM   #2
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Can you adjust the saddle fore/aft enough to create KOPS? What is her height and inseam, and what is the size of the frame?
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Old 09-25-10, 07:16 PM   #3
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It's 50cm ctr to ctr and her inseam is 31" or 79 cm . If the same rules (except for the drops) apply then i'll do a couple of the fit pages online.
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Old 09-25-10, 07:27 PM   #4
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http://www.bikepedia.com/QuickBike/B...kway&Type=bike

This is the bike. I'm thinking it's a womens 19" But it has 170mm cranks...??
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Old 09-25-10, 07:34 PM   #5
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Unless it is a recumbent or a seriously laid back geometry, then yes it is all the same for the most part. Everyone's own personal body geometry is different so her fit will need to be tweaked a bit over the next few weeks/months till she finds the perfect fit.
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Old 09-26-10, 05:49 AM   #6
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1. An inch is a lot but where, exactly, on her knee are you measuring? I sometimes think the whole KOP thing is like using a micrometer to measure from a chalk mark.

2. There's been a lot of research done on effective fit on a bicycle but most (if not all) of it is done with Olympic or Professional level riders. I wonder to what degree it's applicable to middle aged people who are in the process of losing weight and whose flexability is also changing.

3. Everything on a bicycle works together. Changing the relationship of her saddle to the pedals will also change the relationship of her saddle to her handlebars. If she is more interested in comfort than power I'm thinking that the handlebar thing might be more important.
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Old 09-26-10, 10:44 AM   #7
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I have long figured that for most riders KOPS is not that important as evidenced by the number of bike types for which it is impossible to achieve. This includes recumbents, many cruisers with very laid back seat tubes such as Electras as well as the RANS semi-recumbent bikes. Some of the Electras have the seat tube bottom end set back 6" or so from the bottom bracket shell just to add to the effect. Achieving a comfortable upper body position and good saddle height is IMO more important for rider comfort.
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Old 09-26-10, 12:44 PM   #8
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nivek, the bike you showed me seems like a traditional fit-type bike. Just off the top of my head(and I used to fit customers on bikes-properly, I might add) I think she can fit on this size OK. BTW IMO KOPS is a decent starting point for a comfortable, efficient riding position for most people.
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Old 09-26-10, 01:58 PM   #9
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I understand about Recumbents and the newer laid back geometries but her knee is an inch in front of the spindle not behind.
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