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WONGERCHI's Photo WONGERCHI Posts: 3,889
9/22/08 12:47 P

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Cindy:
I get my wheels trued/checked every year or after a crash. My test for truing is to spin the wheel and watch the gap between the rim and the brake pads. If it's relatively consistent then the wheel's fine. If there's noticeable wobble then it's truing time. From time to tome I also go round the wheel grabbing pairs of spokes to see if it's out of true but I don't do this often...

Touch wood I've never had a spoke break on me yet. I ride on 2 pretty bombproof sets of wheels though so that may have something to do with it and when I take the wheels off to give the bike a good cleaning I'll have a good look at the spoke nipples etc.

The roads here are pretty crappy too so I've gotten used to riding "lightly" and making sure my tires are clean and up to the right pressure. Maybe this helps with the spoke issue, maybe not...

In God we trust, all others bring data.
- W. Edwards Demings

If God invented marathons to keep people from doing anything more stupid, the triathlon must have taken Him completely by surprise.
-P.Z. Pearce

Specificity, specificity, specificity.
-Andy Coggan

The plural of "anecdote" is not "data".
- Frank Kotsonis


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RCKWHITNEY's Photo RCKWHITNEY Posts: 470
9/19/08 11:53 A

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Wongerchi
It was scary. My husband now rides the aluminum bike. We've changed the fork to a carbon fiber fork. He doesn't complain about the shimmy so the CF fork may have fixed it or he has more upper body strength or both.

You're right about the trickle down effect; why give away the parts. The stock seat is the first thing to go then the handlebars.
How often do you true your wheels? The LBS looked at them last year and said they were good. So many of my friends have broken spokes this year. There isn't a common thread on the type of wheel since they are riding on different wheel sets and the riders are from light to heavy. The one thing in common is that we ride lots of miles which go over railroad tracks and newly chip-rocked roads.
Cindy

WONGERCHI's Photo WONGERCHI Posts: 3,889
9/19/08 9:29 A

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Cindy:
Hmm, the front end shimmy I've not had any experience with but it sounds scary! An unexpected rear-end wobble is scary enough but on the front end I dread to think...

From what you said my best guess would be that you're not getting enough weight on the front end of the bike. Especially going downhill at speed when you shift to the back and get low.

Do you still ride the alu bike? If you're anything like me what you may find yourself doing is "trickling down" components from the CF bike to the Alu one as you go. I had to change handlebars and seatpost on my roadbike for fit so I'm taking my cross bike into the shop this afternoon to bling it out with faux CF stuff that came stock on my roadbike... Wheels are next, likely after the cross season finishes...

In God we trust, all others bring data.
- W. Edwards Demings

If God invented marathons to keep people from doing anything more stupid, the triathlon must have taken Him completely by surprise.
-P.Z. Pearce

Specificity, specificity, specificity.
-Andy Coggan

The plural of "anecdote" is not "data".
- Frank Kotsonis


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JHOLLNAGEL Posts: 1,768
9/18/08 3:54 P

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Could the shimmy in the front end be a loose connecting fitting of the fork into the stem tube???

I'm a rookie .... but that is what I would think could cause the problem.

Jim

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RCKWHITNEY's Photo RCKWHITNEY Posts: 470
9/18/08 3:24 P

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Wongerchi,
You're right about fit. The aluminum bike's top tube was too long for me even though the height was right. We added a shorter stem, repositioned the seat but that didn't solve it. (note- WSD bikes were limited to 650cm tires and few choices.) Live and learn. Two years later when purchasing and sizing the CF bike, top tube length was high on my list.

The alu bike is an entry level bike whereas the CF bike is a higher end bike. There is a total night and day difference between the 2 bikes in geometry of the frame, components, and wheels. The aluminum bike started my addiction to cycling; the CF keeps me riding longer distances and setting new goals. The ride is so responsive and much more comfortable.

Your messages are so informative; I'm glad you're helping us. Thanks, Cindy

Forgot to add that the shimmy was in the front end whenever the bike went over 30 mph downhills.

Edited by: RCKWHITNEY at: 9/18/2008 (15:25)
JHOLLNAGEL Posts: 1,768
9/18/08 11:16 A

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The feel was like riding on air or carpet as you put it. I did not feel the road. I only felt the worse of the road conditions but not nearly as jarring on the Raleigh.

At the end of the ride I did not feel like I went through the ringer. I was surprised the ride was over ..... with the Raleigh you keep questioning how much longer???

Yeah ... I figure the numbness would go away once I get properly fitted ..... which may need several finer tune ups.

I did miss my aero bars last night;-) I can not tell you the number of times I caught myself trying to get into the aero position with no bars there to grab onto;-) LOL

Jim

I'll report back on the Giant when I get to ride that.

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WONGERCHI's Photo WONGERCHI Posts: 3,889
9/18/08 10:47 A

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Jim:
Heh heh the Trek's a great bike, eh? How was the feel? Did you feel the road or was it like riding on carpet? That's generally the main difference between carbon vs. Alu.

The more responsive steering is likely due to the shorter wheelbase than anything else. I have that issue when going from my Cross to my roadbike. Both frames are practically identical (for all intents and purposes) but the wheelbase on the roadbike is significantly shorter. And it just knifes into corners while the cross bike slides into them.

The hand numbness issue will go away with a proper fit. At least it did for me. If your saddle is positioned correctly and angled right then a stem swap is likely in order.


Cindy:
That's really interesting that you got the rear end shimmy with the Alu bike. I had one with mine too but a bike fit cured that and now it's rock solid (unless the rear tire is underinflated, that was not fun). Strangely enough one of the guys from the triathlon club is selling his CF Giant because of incurable rear-end shimmy... It's all far too strange for me.

In God we trust, all others bring data.
- W. Edwards Demings

If God invented marathons to keep people from doing anything more stupid, the triathlon must have taken Him completely by surprise.
-P.Z. Pearce

Specificity, specificity, specificity.
-Andy Coggan

The plural of "anecdote" is not "data".
- Frank Kotsonis


 current weight: 190.0 
 
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**WILLOW**'s Photo **WILLOW** Posts: 99
9/17/08 10:55 P

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technology is awesome. the hand numbness would cause me significant concern though. this is only one ride and you were numb. what would happen if you were riding daily - or several times a week? could it cause nerve damage if it is pressing in the wrong place to cause this numbness? may or may not be the bike, technique may be involved as well. I would be very cautious - I am not familiar with the different bikes, and mine is a fitness hybrid, I sit fairly upright on it. But, I am a hobby biker, not a serious racer, or mountain biker. I am just in it for fun and fitness and which bike is best suited is different for each of us based on our own goals. My speeds are not nearly like yours and I don't anticipate getting to that level any time soon, if ever. I average 10 MPH on mildly hilly routes. my bike may not be as built for speed ( a TREK WSD FX 7.3)and I know I am not built for speed. my guess is I have a less than average amount of fast twitch muscle fibers. :-)

keep us posted on the bike search - I am glad to hear you are going for a great bike, you deserve it!!!

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RCKWHITNEY's Photo RCKWHITNEY Posts: 470
9/17/08 10:52 P

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Riding a CF bike is so much easier on the body. Sounds like the setup is too short for your upper body which can be fixed with a longer stem and/or seat placement. The LBS can fix the set up. Of course, this is the expensive bike.

With my CF bike, I can go downhills faster with more confidence. My previous bike would shake at the higher speeds. The CF bike is more responsive. It probably has more to do with the bike quality than CF v. Aluminum. The Aluminum bike is an entry level v. the CF is a higher end bike; like the Madonne.

Isn't it fun to test ride these bikes! Enjoy the ride. Cindy

JHOLLNAGEL Posts: 1,768
9/17/08 10:41 P

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Wow .... I'm in love. Boy what a difference in technology vs riding what I currently do. I felt faster on the flats and the rolling hills were a breeze. I was not able to keep up with the group (first group but well ahead of the second group).... although I attribute it not riding since last week.

I did notice that the steering was a little more responsive than what I'm used to. Any slight movement on the handle bars caused me to be jerking the bike all over. It took a little getting used to. I guess it is like driving luxury car ( my bike) than going to a finely tuned sports/race car. I'm wondering if the Giant will react that way as well? I'm sure it is the design of the fork. My has a slight curve and the Trek is practically straight down.

I rode the bike for 30.39 miles in an hour and 28 mins. which gfave me an avg speed of 20.72 .... I was that close to 21. This is with keeping time on my watch.

I was pulling for someone for the whole way .... I will ask him next week what we averaged to see how far off I was.

I was not truly tuned in for the bike .... I felt top heavy ... a lot of my upper body weight was resting on my hands and causing them to go numb. I know I was pushing myself tonight because I almost cramped up my calves. I drank 6-7 20 oz bottles of water and I had 24 oz of heed as well.

I did not feel nearly as exhausted after this ride as I am with my bike. I'm usually so tired after these rides with my bike but tonight I was feeling great.

I felt as though I was able to sprint the last 3-5 miles ...... I know my speed was much faster tonight than other nights in this same section of the route.

The guy with the Giant OCR Composite Limited will have the bike ready either this week end or perhaps next Wed. in time possibly for the group ride. We will see how that goes.

Jim

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