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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 04-25-10, 08:03 PM   #1
yrrej
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Is it me or the tires ( or both)...

I did not get any riding done this winter until march. Over the winter I
gained 12 pounds.

In late feb I took the bike ( Spec Sequoia Comp) in for a tune up and
replaced the Specialized Pro (700x25)tires with Continental Grand Prix 4 Season (700x28)
tires.

I am running the new tires at 100psi.

The ride is much more comfortable than the Specialized tires, but after about
360 miles I cannot seem to produce the average cadence and speeds that I
recorded last year.

Most of the ugly hills I have to climb seem to require the bottom most gearing
on my triple (30x28).

Even going down hill feels a bit sluggish...There is one ultra steep downhill that
I had to hit the brakes intermittently to hold the speed down to 45 mph.

Now I just let it go and still only hit 45 mph.

Are 28s that much slower than 25s?

Should I be running a higher pressure ( the Specialized Pros I ran at 110 psi).

I am currently running at about 210 lbs and will be 72 this summer...
Perhaps my body is trying to tell me something.

This will be my second year of biking

Jerry
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Old 04-25-10, 08:05 PM   #2
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Your getting older.
go slower.

The only way I know would be to use two sets of wheels with the different tires on them.
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Old 04-25-10, 08:12 PM   #3
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Did you recalibrate your bike computer? You need to when you change tire size.
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Old 04-25-10, 08:31 PM   #4
yrrej
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Originally Posted by DieselDan View Post
Did you recalibrate your bike computer? You need to when you change tire size.
yes i did...but in any case that should not affect my cadence...

jerry
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Old 04-25-10, 09:51 PM   #5
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Quote:
Originally Posted by yrrej View Post
In late feb I took the bike ( Spec Sequoia Comp) in for a tune up and
replaced the Specialized Pro (700x25)tires with Continental Grand Prix 4 Season (700x28)
tires.

I am running the new tires at 100psi.

Should I be running a higher pressure ( the Specialized Pros I ran at 110 psi).
I'm not sure but I think the bold sections explains it. Wider tires and lower pressure both come into play. Of course, for the hills and flats I would venture conditioning is the biggest issue (taking winter off), but for the downhill I think it's pressure and wind.
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Old 04-25-10, 11:06 PM   #6
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You mentioned a tune up, is it possible that some wheel bearings have too much preload (too tight) because of the tuneup? Or maybe the wheel bearings need some attention.
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Old 04-26-10, 06:26 PM   #7
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Wider tires and lower pressure both come into play
Kind of... for an identical tire those conditions will result in a higher rolling resistance but tread pattern and tire composition also have a major effect. IMO, 10psi and 3mm is too close to make any generalizations.

Since you are seeing different behavior while coasting down a hill I would look at the tires or my riding position (air resistance).
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Old 04-26-10, 06:30 PM   #8
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imho, Conti's are very tall tires...meaning for the same size, say 700x28s, the conti's tend to have the tread further away from the rim. Is it possible that is contributing to the issue?
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