Considerably Slower on Today's Ride
#1
Senior Member
Thread Starter
Join Date: Jan 2011
Posts: 2,977
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 1638 Post(s)
Liked 741 Times
in
495 Posts
Considerably Slower on Today's Ride
There is a 17 mile ea. way point A to point B then back to A, MUP route I ride fairly often. Today I was a good four minutes slower each way. There were two changes, first I lowered my air pressure, following the 45/55% based on my and the bikes combined weight. I was 80 psi. front vs. my usual 120, and 99 rear vs. my usual 120. The ride was definitely smoother, and didn't feel slower. The second change, I concentrated on spinning vs. mashing the gears. My knees felt much better, my heart rate was about 15 bpm average lower than usual.
Was the lower psi. more rolling resistance, the spinning a psychological thing, my legs were going faster, so I assumed I was going faster, maybe both?
Was the lower psi. more rolling resistance, the spinning a psychological thing, my legs were going faster, so I assumed I was going faster, maybe both?
__________________
nine mile skid on a ten mile ride
nine mile skid on a ten mile ride
#2
Senior Member
Join Date: Apr 2006
Location: Gig Harbor, WA
Posts: 2,470
Bikes: Surly Long Haul Trucker, Gary Fisher Hoo Koo E Koo, Dahon Mu P 24 , Ritchey Breakaway Cross, Rodriguez Tandem, Wheeler MTB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 32 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
I haven't noticed much speed difference during a fairly small change of tire pressure. YMMV. If your not used to spinning, it may take awhile to get used to it and back to your normal times
#3
Senior Member
There is a 17 mile ea. way point A to point B then back to A, MUP route I ride fairly often. Today I was a good four minutes slower each way. There were two changes, first I lowered my air pressure, following the 45/55% based on my and the bikes combined weight. I was 80 psi. front vs. my usual 120, and 99 rear vs. my usual 120. The ride was definitely smoother, and didn't feel slower. The second change, I concentrated on spinning vs. mashing the gears. My knees felt much better, my heart rate was about 15 bpm average lower than usual.
Was the lower psi. more rolling resistance, the spinning a psychological thing, my legs were going faster, so I assumed I was going faster, maybe both?
Was the lower psi. more rolling resistance, the spinning a psychological thing, my legs were going faster, so I assumed I was going faster, maybe both?
I think spinning is probably a better thing, especially as you allude to it improving the feel of your knees. So I would keep riding with the higher cadence for a week or so, take a time, then lower the tyre pressures. I wouldn't go so low as you did today; I also don't differentiate between front and rear. However, you don't say what size (width) your tyres are. If 23C, I would probably opt for 90 front and rear.
FWIW, spinning is probably the reason why you took more time to do your ride. It's a learned action, and over time, you will be able to shift to harder gears while maintaining the same cadence, and will therefore ride faster.
#5
Senior Member
Join Date: Apr 2011
Location: Alpharetta, GA
Posts: 15,280
Bikes: Nashbar Road
Mentioned: 71 Post(s)
Tagged: 0 Thread(s)
Quoted: 2934 Post(s)
Liked 341 Times
in
228 Posts
There is a 17 mile ea. way point A to point B then back to A, MUP route I ride fairly often. Today I was a good four minutes slower each way. There were two changes, first I lowered my air pressure, following the 45/55% based on my and the bikes combined weight. I was 80 psi. front vs. my usual 120, and 99 rear vs. my usual 120. The ride was definitely smoother, and didn't feel slower. The second change, I concentrated on spinning vs. mashing the gears. My knees felt much better, my heart rate was about 15 bpm average lower than usual.
Was the lower psi. more rolling resistance, the spinning a psychological thing, my legs were going faster, so I assumed I was going faster, maybe both?
Was the lower psi. more rolling resistance, the spinning a psychological thing, my legs were going faster, so I assumed I was going faster, maybe both?
#6
rebmeM roineS
Join Date: Jan 2006
Location: Metro Indy, IN
Posts: 16,216
Bikes: Bacchetta Giro A20, RANS V-Rex, RANS Screamer
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 653 Post(s)
Liked 347 Times
in
226 Posts
If you make more than one change in a process, you can't say with assurance which change caused the results to be different.
(I would guess spinning, too.)
(I would guess spinning, too.)
__________________
Bacchetta Giro A20, RANS V-Rex, RANS Screamer
Bacchetta Giro A20, RANS V-Rex, RANS Screamer
#7
Senior Member
Join Date: Feb 2004
Location: St Peters, Missouri
Posts: 30,225
Bikes: Catrike 559 I own some others but they don't get ridden very much.
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 1572 Post(s)
Liked 643 Times
in
364 Posts
My guess is that it had to do with the bold-faced part. You expect spinning at a higher cadence to increase the heart rate, but your's was lower. I would investigate the theory that, unused to the higher cadence, your effort level was lower than your normal performance.
__________________
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.
#8
Senior Member
Thread Starter
Join Date: Jan 2011
Posts: 2,977
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 1638 Post(s)
Liked 741 Times
in
495 Posts
Thanks for the replies!
i think I will go back to the pressures I had been running and see what comes of it, and keep working on the spinning.
i think I will go back to the pressures I had been running and see what comes of it, and keep working on the spinning.
__________________
nine mile skid on a ten mile ride
nine mile skid on a ten mile ride
#9
Senior Member
Join Date: Jun 2008
Location: Vancouver, BC
Posts: 9,201
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 1186 Post(s)
Liked 289 Times
in
177 Posts
The ride was definitely smoother, and didn't feel slower. The second change, I concentrated on spinning vs. mashing the gears. My knees felt much better, my heart rate was about 15 bpm average lower than usual.
Was the lower psi. more rolling resistance, the spinning a psychological thing, my legs were going faster, so I assumed I was going faster, maybe both?
Was the lower psi. more rolling resistance, the spinning a psychological thing, my legs were going faster, so I assumed I was going faster, maybe both?
Do you have cycle computer that shows speed?
#10
Senior Member
Thread Starter
Join Date: Jan 2011
Posts: 2,977
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 1638 Post(s)
Liked 741 Times
in
495 Posts
I have been using the Strava app on my phone, my eye sight is so bad up close, I can't see it while I am riding, I have to wait until I get done and put on my glasses to see it.
__________________
nine mile skid on a ten mile ride
nine mile skid on a ten mile ride
#11
Senior Member
Join Date: Dec 2010
Location: Above ground, Walnut Creek, Ca
Posts: 6,681
Bikes: 8 ss bikes, 1 5-speed touring bike
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 86 Post(s)
Likes: 0
Liked 4 Times
in
4 Posts
if you want to have a clear indication of performance changes, it's best to change one thing at a time...
#12
don't try this at home.
Join Date: Jan 2006
Location: N. KY
Posts: 5,940
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 974 Post(s)
Liked 512 Times
in
352 Posts
At 170 lbs, I used 90-95 psi front / 105-110 psi rear on 23c GP4000S tires. Under 90 psi made the bike feel a little mushy, instead of the quick steering with higher pressures. (Now I'm riding 25c at 85/100-105)
Last edited by rm -rf; 05-18-14 at 09:02 PM.
#13
Senior Member
Thread Starter
Join Date: Jan 2011
Posts: 2,977
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 1638 Post(s)
Liked 741 Times
in
495 Posts
Do you need reading glasses? Stick-on bifocals work great. See this previous thread post. But it still might be hard to see the phone in bright sunlight.
At 170 lbs, I used 90-95 psi front / 105-110 psi rear on 23c GP4000S tires. Under 90 psi made the bike feel a little mushy, instead of the quick steering with higher pressures. (Now I'm riding 25c at 85/100-105)
At 170 lbs, I used 90-95 psi front / 105-110 psi rear on 23c GP4000S tires. Under 90 psi made the bike feel a little mushy, instead of the quick steering with higher pressures. (Now I'm riding 25c at 85/100-105)
I too am on GP4000S 23c tires. My combined weight with the bike is 180#, so the 45/55 split was basically 80/100, I will likely go 90/105, see what it feels like.
On my route, 17 mi. each way, my first ride this year was 58 min., after my fifth I was down to just over 50 min. and looking for sub 50 when I made the changes and jumped back to 54 min. I think I need to ignore the time somewhat and concentrate on improving the higher cadence.
__________________
nine mile skid on a ten mile ride
nine mile skid on a ten mile ride
#14
Senior Member
Thread Starter
Join Date: Jan 2011
Posts: 2,977
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 1638 Post(s)
Liked 741 Times
in
495 Posts
Do you need reading glasses? Stick-on bifocals work great. See this previous thread post. But it still might be hard to see the phone in bright sunlight.
At 170 lbs, I used 90-95 psi front / 105-110 psi rear on 23c GP4000S tires. Under 90 psi made the bike feel a little mushy, instead of the quick steering with higher pressures. (Now I'm riding 25c at 85/100-105)
At 170 lbs, I used 90-95 psi front / 105-110 psi rear on 23c GP4000S tires. Under 90 psi made the bike feel a little mushy, instead of the quick steering with higher pressures. (Now I'm riding 25c at 85/100-105)
__________________
nine mile skid on a ten mile ride
nine mile skid on a ten mile ride
#15
Senior Member
Join Date: Jun 2009
Posts: 404
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
hard to have identical wind conditions each day, motivation, time of day, what you ate etc..but agree probably the increased cadence was the difference. I think its good to experiment but at the end of the day its never fast enough...