Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Fifty Plus (50+) Share the victories, challenges, successes and special concerns of bicyclists 50 and older. Especially useful for those entering or reentering bicycling.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-10-07, 08:01 AM   #1
WillisB
Do I use too many commas?
Thread Starter
 
Join Date: Aug 2006
Location: Central New York
Bikes: Giant Yukon SE
Posts: 621
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Tire question

The rubber on my Miyata is pretty old. I intend to replace the tires ASAP. They are currently 700C28's. Would there be any real advantage/disadvantage to going with 700C25's? The ride is quite comfy with the 28's. Will it be harsher with 25"s?

Thanks!
WillisB is offline   Reply With Quote
Old 08-10-07, 08:19 AM   #2
maddmaxx 
Small Member
 
maddmaxx's Avatar
 
Join Date: Nov 2003
Bikes: Leader home built hardtail, Diamondback Response
Posts: 7,136
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 150 Post(s)
The general rule of thumb is..the smaller the tire, the lower the air volumn will be and the less flexable the sidewall will be. This equates to less comfort. The other half of the "general" rule is...smaller is faster due to less rolling resistance (not always absolutely true) and less air drag.

Unless you are in a position to do an A-B comparison on the same bike you have to make some assumptions based on the general rules.

http://www.velonews.com/tech/report/...s/13059.0.html

The link above has an interesting short analysis of rolling resistance and some possible myths in the paragraph about tire pressure.
maddmaxx is offline   Reply With Quote
Old 08-10-07, 08:33 AM   #3
DnvrFox
Banned.
 
DnvrFox's Avatar
 
Join Date: Aug 2001
Bikes:
Posts: 20,916
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I doubt you will notice a lot of difference for the same tire, but give it a try and find out. I have found that the make and model of the particular tire makes for more variation (i.e., Conti 2000 ultra vs. Specialized Armadillo, etc.).
DnvrFox is offline   Reply With Quote
Old 08-10-07, 10:16 AM   #4
BSLeVan
Senior Member
 
Join Date: Feb 2007
Location: S.E. Pennsylvania, USA
Bikes:
Posts: 1,737
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
A lot of the comfort issue also has to do with the amount of weight the tires are carrying. Someone weighing 130 lbs is going to be much less concerned with 25s vs. 28s than someone weighing 220 lbs. I hover around the 195 to 205 range. I have a touring bike with 28s, two road bikes with 23s and one road bike with 25s. The 25s seem just as comfortable to me as the 28s on all but the most rough road surfaces.
BSLeVan is offline   Reply With Quote
Old 08-10-07, 10:31 AM   #5
Jet Travis
Ride Daddy Ride
 
Jet Travis's Avatar
 
Join Date: Feb 2007
Location: Villa Incognito
Bikes: 1983 Trek 720; 1983 Trek 620; 1989 Gi Cannondale Bad Boy Ultra; LeMond Victoire; Bike Friday Pocket Rocket Pro
Posts: 2,648
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Maybe it's all in my head, but for most riding I prefer the 25s to 28s. Seems a little less cushy a little more speedy.
__________________
"Light it up, Popo." --Levi Leipheimer
Jet Travis is offline   Reply With Quote
Old 08-10-07, 11:22 AM   #6
stapfam
Time for a change.
 
stapfam's Avatar
 
Join Date: Jan 2004
Location: 6 miles inland from the coast of Sussex, in the South East of England
Bikes: Dale MT2000. Bianchi FS920 Kona Explosif. Giant TCR C. Boreas Ignis. Pinarello Fp Uno.
Posts: 19,915
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Don't think there will be a great deal of difference from a 28 to a 25 but down to a 23 and WOW. Get a Michelin or Conti in 23 and pump em up to 120 psi and ride. Rolling resistance wil be less, speed will be up but Comfort might be a bit lacking.

Or failing that- Just put 140 psi into the 28's.
__________________
How long was I in the army? Five foot seven.


Spike Milligan
stapfam is offline   Reply With Quote
Old 08-10-07, 11:23 AM   #7
Tom Bombadil
His Brain is Gone!
 
Tom Bombadil's Avatar
 
Join Date: Sep 2006
Location: Paoli, Wisconsin
Bikes: RANS Stratus, Bridgestone CB-1, Trek 7600, Sun EZ-Rider AX, Fuji Absolute 1.0, Cayne Rambler 3
Posts: 9,980
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rivendell usually has interesting opinions on bicycle topics, and tires are no exception.

http://www.rivbike.com/node/18
Tom Bombadil is offline   Reply With Quote
Old 08-10-07, 07:04 PM   #8
WillisB
Do I use too many commas?
Thread Starter
 
Join Date: Aug 2006
Location: Central New York
Bikes: Giant Yukon SE
Posts: 621
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks for the input everyone!

I wanted something with puncture resistance to replace the 18 yr old tires on the bike. An LBs had some Bontrager Race Lite Hardcase tires for $10 off. I went with the 25s. While not as smooth riding as the original tires I feel a lot better with the new rubber between me and the road. They are only a little harsher than the originals.
WillisB is offline   Reply With Quote
Old 08-10-07, 07:37 PM   #9
Terrierman
Senior Member
 
Terrierman's Avatar
 
Join Date: Oct 2006
Location: SWMO
Bikes:
Posts: 3,179
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 123 Post(s)
Now that I won't be influencing you, I can reveal that I just ordered a set of Continental Ultra Gatorskins in 700 x 25 for my Coda Elite, to replace the worn out in 1300 miles 700 x 28 Vittoria Zaffiros that came on it. From LBS for $30.00 each!!
__________________
It's all downhill from here. Except the parts that are uphill.
Terrierman is offline   Reply With Quote
Old 08-10-07, 08:55 PM   #10
roadiespinner
Senior Member
 
roadiespinner's Avatar
 
Join Date: Mar 2007
Location: Reno Nv
Bikes: Della Santa, Bike Friday Air Glide, 1974 Schwinn Paramount, Cannondale t2000 Touring, Cannondale r500 Road Silk, LeMond Buenos Aires, Trek 7000 mtn bike, Sears and Roebuck[ made by Puch. I have had up to 36 bikes at one time. I am a sick person.
Posts: 145
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The next time I need tires, I am going to look at the Armadillo 25/23[or23/25?] It has a 25 casing and 23 tread and the Armadillo flat resistance.
roadiespinner is offline   Reply With Quote
Old 08-10-07, 11:16 PM   #11
TysonB
Senior Member
 
Join Date: Sep 2004
Location: Cushing, Oklahoma
Bikes: 1969 Peugeot U08, unknown MTB circa 1980, '93? Merckx MX-Leader
Posts: 628
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You asked this just to cause controversy on this forum didn't you?

I find 700x23's are worlds faster than the original equipment 28 inch x 1.25's on my Peugeot U08. I even noticed a speed difference vis 700x25's. Other's here have not.

Remember, though, and I don't think there would be any controversy over this point, that even with tires with the same published measurements, there are actual differences in the size. AND, even if they are the same size, some of the 'racing-type" tires are much faster than the all-weather or more puncture resistant tires.

Play around with several different types. In the big scheme of things, tires are not all that expensive.

IMHO
Tyson
TysonB is offline   Reply With Quote
Old 08-11-07, 03:36 AM   #12
maddmaxx 
Small Member
 
maddmaxx's Avatar
 
Join Date: Nov 2003
Bikes: Leader home built hardtail, Diamondback Response
Posts: 7,136
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 150 Post(s)
Racing tire manufacturers tend to fudge the numbers slightly to gain the impression of additional performance over rivals. Racers tend to pay a lot of attention to weight and perceived rolling resistance. My favorite Kenda Kalliente Iron Cloak 23mm road tires are in no way as wide as most other 23's so because there is less tire there, they are lighter. Marketing or just another way to make a measurement......you make the call.

There are almost as many different tires out there as there are saddles. Everyone likes one of them.
maddmaxx is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 04:35 AM.