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GIANT-STEPS SparkPoints: (65,371)
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3/4/09 11:10 A

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Sewups are sewn together. I'm having trouble finding a diagram online but to visualize it imagine a clincher tire that instead of the casing wraping around the tire beads meets in the middle and is sewn together. A base tape is then glued on to protect the stitches and then the unit is then glued on the concave surface of a rim.

Fixing flats involves pulling the tire off the rim it is glued to, pullng the base tape off, findign the hole cutting the stitches near the puncture, pulling out enough tube to patch, tucking it back in, sewing the tire closed, glueing the base tape back on, then gluing it back on the rim. As you can see repairing a flat on a sewup tire is a lot more work than a clincher. That and the extra expense is the reason few people ride sewups any more.

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3/3/09 7:21 P

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Road sewups have higher rolling resistance than modern high performance clinchers. The additional rolling resistance comes from hysteresis losses in the rubbery glue. Track sewups do not have this problem because they are glued on with hard shelac instead of mastic. Decades ago clincers were nothing like today's tires so in the past sewups did have a rolling resistance advantage but not today.

At competitive speeds the additional rollng resistance can generally be ignored. Rolling resistance increases lineraly with speed while aerodynamic drag increases at the square of speed. At 25+ miles/hour rolling resistance is dwarfed by aerodynamic drag.

Sewups do have a weight advantage. Sewup rims do not need to hold the tire on so they are significantly lighter. 300gm sewup rims used to be common (I used to race on 320gm Ambrosio Cronos and I wasn't a small guy). Sewup tires are also generally lighter than the tire/tube/rim strip combination used on clinchers. Having such light wheels makes the bike feel very lively.

I always just liked the way my bikes rode and handled with sewups. I would attack corners more confidently and found more traction in the rain on quality sewups than I do on clinchers.

SARAHGMD Posts: 834
3/3/09 3:34 P

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Great, thanks I was picturing something involving thread and a needle.

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KIWIJOHN007's Photo KIWIJOHN007 SparkPoints: (0)
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3/3/09 12:48 A

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sewups are where the tyre and tube are 1 unit, clinchers are separate tyres and tubes. The benefit of sewups also commonly known as tubs or tubulars is that the are as close to spherical as you can get which minimises rolling resistance.

Hope this helps;)

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SARAHGMD Posts: 834
3/2/09 4:38 P

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For those of us newwer to biking what are sewups?

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GIANT-STEPS SparkPoints: (65,371)
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3/2/09 2:30 P

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I've rebuilt all my sewups as clinchers except one beat up old pair of Rovals.

If I'm going to ride sewups again I'll have to build up a new pair of wheels.

When I first started riding seriously clinchers weren't nearly as good as they are today so almost everyone had sewups. As clinchers got better most racers just saved for their sewups for races and trained on clinchers. As clinchers continued to improve most racers quit using sewups all together. I remember when the Michelin Hi-Lite came out that droves of racers abandoned sewups. Even in the Tour de France most riders use clinchers now.

Sewups are largely an anacronysm now but then again so am I.

WONGERCHI's Photo WONGERCHI Posts: 3,889
3/2/09 11:57 A

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GIANT-STEPS:
Tubbies are still around mate, if you have an old wheelset then you should slap them on! I had the privilege to ride a set in cyclocross practise one day and the difference between tubbies and clinchers is amazing. You can run such low pressures on tubulars and not worry about pinch flatting on rocks, roots etc.

Never ridden a set on the road though. Would I like to? You bet.

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3/2/09 11:17 A

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One thing I miss from the old days is sewups. I know that clinchers have lower rolling resistance and that it is hard to justify the added expense and hassle of sewups compared to high performance clinchers but there was just something about how a bike felt with sewups. I never found clinchers that had the smooth, lively, and confidence inspiring ride of sewups. I've never been great at cornering but I always would attack corners a little more aggressively on sewups and when it rained no clincher seemed to get the same traction that a cotton sewup did.

I had many happy miles on Clement Criterium Cottons, and Vittoria CXs, Continental Sprinters,

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3/2/09 1:27 A

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I bought a new road bike about 2years ago and still love the feeling of getting out on the road and riding. My old road bike was retired to the trainer and I train on it when the weather isn't so good.



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FREECLOUD's Photo FREECLOUD Posts: 1,548
2/28/09 4:52 P

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I know how you feel, Giant. I've had my MTB for 15 years and we've been through a lot together. I believe it will outlast me ;)

I spoke with another bike shop owner today that said exactly what you did about 700 c wheels on bikes below 50 cm. There's a lot to learn.

Edited by: FREECLOUD at: 2/28/2009 (16:53)
Wendy
~~~~~

"I have achieved oneness with the road - Please dial 911 for me" - Unknown

"A bicycle ride is a flight from sadness." James E. Starrs, The Literary Cyclist

"We run, not because we think it is doing us good, but because we enjoy it and cannot help ourselves...The more restricted our society and work become, the more necessary it will be to find some outlet for this craving for freedom."
-Sir Roger Bannister, first runner to run a sub-4 minute mile


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GIANT-STEPS SparkPoints: (65,371)
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2/27/09 11:34 A

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In my experience bikes below 50cm with 700c wheels just don't handle right. Several of my short customers never found comfort until they tried a bike with a 24" front wheel.

While bikes are expensive they can last a long time. My two bikes were both expensive in their day but are about 20 and 35 years old respectively. My wife teases me that I need a new bike but I tell her that the day I have trouble keeping up with her is the day I look for a new bike. My newer bike is the bike I rode my first group ride, my first rally, my first century, and my first USCF race on so it has a lot of memories; I'm sure I'll ride it until it breaks.

FREECLOUD's Photo FREECLOUD Posts: 1,548
2/26/09 8:23 P

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No, I'm definitely not leggy ;) An inseam is measured from the very top of the inside of the thigh to the foot. For a total height of 61 inches, my inseams is only 28 (longer torso, shorter legs)

My LBS fitted me for a 44cm frame. I usually see these with 650 wheels, but occasionally with 700. Finding a used one is a real feat, so I'll probably have to buy new. My options are just limited (as is my funding! :)

Cleon, you really scored! Enjoy!!

Edited by: FREECLOUD at: 2/26/2009 (20:34)
Wendy
~~~~~

"I have achieved oneness with the road - Please dial 911 for me" - Unknown

"A bicycle ride is a flight from sadness." James E. Starrs, The Literary Cyclist

"We run, not because we think it is doing us good, but because we enjoy it and cannot help ourselves...The more restricted our society and work become, the more necessary it will be to find some outlet for this craving for freedom."
-Sir Roger Bannister, first runner to run a sub-4 minute mile


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GIANT-STEPS SparkPoints: (65,371)
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2/26/09 1:58 P

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"I'm still looking and trying to find the one that works best for me. My challenge is that I'm 5'1" and have a 28" inseam. But it can be done!"

How are you measuring your inseam? 28" sounds long for someone 5'1" but you could be leggy for your height. I'd guess that a 17" or 49cm frame would be your best fit. A problem is that bikes below 50cm with standard size wheels often handle poorly because of the compromises that have to be made to make that small a bike with full size wheels. If you have a short torso you will probably need a bicycle with a 24" front wheel to avoid being too stretched out.

DODGEGM's Photo DODGEGM Posts: 1,235
2/26/09 10:11 A

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Wish I could say got a new road bike, I am still looking, congrats on your purchase

The Picture on the left is my motivation to get in shape and lose weight!!!!!!!


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CLEONJAY's Photo CLEONJAY Posts: 1,100
2/26/09 1:55 A

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Okay, it's a Giant OCR3 and the girl only rode it 5 times. Some of the tags were still attached!!! I looked at the retail value and it ranged from 750 to 1300 depending on the shop/site and I only paid 490 so I feel like I scored. I definitely want the back rack and plan on getting it this weekend. Also it needs a kickstand and bell. Other than that it's freakin awesome!

Jaycee

"Where I am today is where my mind put me, where I'll be tomorrow is where my mind put me" -- Billy Blanks



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BEVPRESLEY's Photo BEVPRESLEY SparkPoints: (130,067)
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2/25/09 9:13 P

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Congrats on the new-to-you bike. I bet it does feel like you are flying.

beverly

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FREECLOUD's Photo FREECLOUD Posts: 1,548
2/25/09 6:50 P

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Congratulations! What did you get? New, used...whatever! As long as you're happy and the bike fits well, you are one lucky cycler :)

I'm still looking and trying to find the one that works best for me. My challenge is that I'm 5'1" and have a 28" inseam. But it can be done!

Wendy
~~~~~

"I have achieved oneness with the road - Please dial 911 for me" - Unknown

"A bicycle ride is a flight from sadness." James E. Starrs, The Literary Cyclist

"We run, not because we think it is doing us good, but because we enjoy it and cannot help ourselves...The more restricted our society and work become, the more necessary it will be to find some outlet for this craving for freedom."
-Sir Roger Bannister, first runner to run a sub-4 minute mile


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MTNBIKENV's Photo MTNBIKENV SparkPoints: (15,447)
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2/25/09 4:32 P

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Congrats! I remember getting my first road bike and how super cool it was to fly down the street so easily. And good for you for commuting to work! I have a Ridley road bike that I use for the more serious rides, and now I have a restored circa 70s Univega, heavy steel frame, that I use for getting around town for basic stuff, and a touring bike with panniers for groceries. Trying to leave the car parked as much as possible... I love the whole idea of living 'green'.

Marnie
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A ship is safe in harbor, but that's not what ships are for.

DAVISJH's Photo DAVISJH Posts: 64
2/25/09 2:33 P

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Great news!! Enjoy the ride(s) and getting accustomed to the transition to a road bike.

2009 Cycling Goal: 2,750 miles (3,500 miles 8/15)
Year to 10/2: 3,255 miles
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2008 2,500 mi/2,419.1 logged (80.9 miles short)
2007 (1/2 Year): 1,000 mi/ 1,002 logged!!


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PERRYR's Photo PERRYR Posts: 668
2/25/09 12:42 P

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I should mentioned rack options:
My favorite - the type that clamp to your seat post - easy to install and remove. I suggest a pack that straps to it with velcro. Very versatile, inexpensive at Nashbar...

2. Basic rack that will allow you to use the same pack - They are about the size of a small lunch cooler. Light weight but harder to remove. Benefit is quasi fender but road bikes just don't look as cool with a rack.

3. A more substantial rack that allows paniers. Allows you to haul a lot more stuff....

I have all three and found that the post type worked best for me until I installed a carbon seat post. If I need to carry anything now I use my mountain bike.

SARAHGMD Posts: 834
2/25/09 12:14 P

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Swwet! Congratulations!

You can put a rack on the back that you can hand saddle bags off. That way you can pull most of the weight off when you really want to zoom.

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MCKNIGHTRN's Photo MCKNIGHTRN Posts: 67
2/25/09 12:14 P

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Road bikes are the best! Check out these websites if you don't have a local bike shop: teamestrogen.com terrys sierratradingpost.com performancebikes
I'm addicted to shopping at teamestrogen and sierratradingpost; you can find things 20-40% cheaper.
Enjoy your road rides! I started riding last April and now do organized rides that are 50-60miles...love it!

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PERRYR's Photo PERRYR Posts: 668
2/25/09 12:11 P

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Congratulations on the new bike!!!!!

Anything I can do to help with advice, please just ask.

There are many web sites that can help with getting the fit tuned in for you. Just remember that it's your body and your bike, so if you like it shorter, lower, etc, that's what works for you.

What kind of bike did you get?

IRISH98's Photo IRISH98 SparkPoints: (18,717)
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2/25/09 12:05 P

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I'm jealous. I'm looking for a road bike, but I can't afford much! Congrats!!

2010 Goals:
Get under 6 hours for a half Ironman triathlon
Get under 8 min/mi for a 5K - DONE 4/3

2010 Big Races:
Jan 15-17 Bermuda Half Challenge (8:15 Mile, 1:01:20 10K, and 2:11:32 half marathon)
June 6 Mooseman 70.3 triathlon (6:30:25)
Aug 22 Timberman 70.3 triathlon (6:10:14)


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CLEONJAY's Photo CLEONJAY Posts: 1,100
2/25/09 12:04 P

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Well, I test rode a (used) road bike and loved it. I bought it and rode it this morning. The only thing is that I need to raise the seat post and get some sort of trunk system for the back for my stuff (I'm back to having the backpack on which sucks), but it was so nice to be able to down shift and go up the hills without standing and pedling this morning (my crappy used steel mountain bike is stuck in 6th gear (out of 7)). I biked to work (oh, it cut 10 mins off my commute, felt like I was flying!).

Jaycee

"Where I am today is where my mind put me, where I'll be tomorrow is where my mind put me" -- Billy Blanks



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