September 30, 2014 Login  


Tirade on road discs
Last Post 08/02/2014 09:59 PM by Dale Dale. 46 Replies.
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Author Messages
dkri

Posts:80

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07/26/2014 08:53 AM
Dale - All in the name of science, indeed. Also, body armor.

Steel - We aren't able to source the Wheelhouse anymore (supplier went insane) so that's a dead end for us. Wheelhouse MkII (sex bomb, hand made in Italy) isn't ready yet, so no testing of our frames. Check your skewers.

jmdirt - I hear you, I just always had 6 bolt hubs. Now WI has nice centerlocks, and I'm dying to build a set of wheels on DT240 straight pull center locks.

formerly dkri
Keith Richards

Posts:737

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07/28/2014 11:19 AM
dkri--just got back from Stowe, VT yesterday.

Smugglers Notch is crazy man! I also did Weeks Hill and Stagecoach Rd. The descent off of Stagecoach into Morristown is NUTS!

Sorry fro the threadjack....I approve of your testing protocol!
----- It is his word versus ours. We like our word. We like where we stand and we like our credibility."--Lance Armstrong.
longslowdistance

Posts:680

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07/28/2014 05:02 PM
Your rode parts of a classic two lap 86 mile race. One of my all time favorites.
Keith Richards

Posts:737

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07/28/2014 05:43 PM
Mahn....the terrain out there is technical. Between the severe climbs and the "all hands on deck" descending it was a serious solo 40 miles. I was totally unprepared with a 42/26 on my training bike. My family drove Stagecoach to meet me for lunch at Morristown and when they got out of the car they just shook their heads, 'you rode a bike here on THAT road?!?!?"
----- It is his word versus ours. We like our word. We like where we stand and we like our credibility."--Lance Armstrong.
79pmooney

Posts:1129

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07/28/2014 06:15 PM
Keith, did you do up from Stowe and over? The old race? That descent was one of the fastest I've ever done. The word was out that you only needed brakes for the first two corners. Got it. First time it was drizzling at the top. Couldn't see through my glasses. Just followed the yellow line staying a couple of feet off it. Didn't see the big frost heave until it was about 20' away. Just enough time to grip the bars. Hit it hard! Got kicked a couple of feet into the air. Bike (my brand new Fuji Pro) came through perfect, except the cheap Hupel Rider seatpost was bent! I won a Zeus post that race so all was good.

Oh, and gearing? I was a young stud. 42-23. Seat and post neve3r got used for the climb!

And to get a little on track. Dia Comp Grand Compe sidepulls. Good brakes.

Ben
SideBySide

Posts:175

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07/28/2014 06:21 PM
Posted By Keith Jackson on 07/28/2014 05:43 PM
they just shook their heads
But you probably get that a lot. 

Keith Richards

Posts:737

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07/28/2014 08:41 PM
Ben, I was in staying in Stowe proper, right off of 108. And WORD on climbing in the 42. You will stand and gut it out...it is the only way to get up those climbs. Character building. No, character revealing. I forgot how much I enjoy the outer limits of road cycling.
----- It is his word versus ours. We like our word. We like where we stand and we like our credibility."--Lance Armstrong.
longslowdistance

Posts:680

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07/28/2014 09:37 PM
Back in the day, one maniac named Scott Dorwart (high level XC skier, real hammerhead type) used a 42x18 low gear.
42x23 seemed just right back then, but I always saw stars by the top of the notch. 60 mph descent, then the hot sunny slog east on rt. 15.
It was the west hill road climb connecting laps one and two that really hurt. The race always lit up there.
Keith Richards

Posts:737

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07/29/2014 10:23 AM
Dude, Weeks and West Hill are BEASTS.
----- It is his word versus ours. We like our word. We like where we stand and we like our credibility."--Lance Armstrong.
79pmooney

Posts:1129

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07/29/2014 11:51 AM
lsd, David Lamb rode the juniors race'77 on a Florida straight block, 14-18 I believe.

Ben
Ride On

Posts:435

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07/29/2014 05:39 PM
Dave I've always been interested in seeing how tire pressure affects braking. My thought was that high tire pressures lead to lower friction/grip on the road which affected braking performance. If you lower the tire pressure do you get better grip and then not have to brake as often or as hard and therefore reduce the rim temps ? The type of rubber used to make the tire would also have an effect. A ton of variables to play with Discs just seem like trying to solve the problem with a sledge hammer.
longslowdistance

Posts:680

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07/29/2014 07:15 PM
Yes lower pressure = better braking
dkri

Posts:80

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08/01/2014 07:37 PM
Sorry, been in the midst of a crazy crazy week. Left Saturday for DC (I am once again really dkri, not dkdc as I was for a long time), did a bunch of stuff with my business partner, rode the 10am for the first time in about a year with the ex (? I'm sure we have no idea what to call each other, we're still really close), got a quality dose of hate from the Muscle (I have no idea why he seems to dislike me so much, it's super weird - but he's slowed down a ton), and arrived in Blowing Rock, NC on Sunday. Monday I did a few repeats down Beech Mountain, first with 40 pounds in a bag, then with 15 pounds in a bag. Which meant I climbed Beech with 15 pounds in a bag. Not that fun. Then I climbed Beech again, to ride down with no weight. The video of that is here https://www.youtube.com/watch?v=VyzL8iHJ33s Got stuck behind cars but still made it down about 5 minutes faster (accounting for the time I spent stopped to check temp on the "slow" runs) than I had when I was mimicking "timid descender man." Finally, I had to climb up Beech again to get the car.  That was a lot of climbing that day. 

The first two runs down I stopped several times to shoot the rim temps. 175# and really bad technique gets rims hotter than 200# and moderately bad technique. 160 pounds going nuts to the wall doesn't do anything to the rim temps - even stuck behind the cars, it's no issue.

There was a freshly painted stencil in the road that said "Viva Lance."  Lance has some history in the area.  A photo of me riding past that is on our FB page, it's pretty funny. 

Then it was off to Mooresville, NC - the beating heart of NASCAR and home to the A2 wind tunnel. There, we tested most of the wheels we make (if we tested all of our alloy variants, we'd have gone bankrupt), as well as the disc variants of our carbon wheels, the validity of the shallow front/deep back setup, different tire widths on different wheels, wheels in bikes, and finally we left some wheels down there for a test that our former forum host will be publishing.

Ever notice how differently some tires inflate on some rims? That turns out to be a huge thing.

Ride On - I totally agree with lsd. Traction is traction, whether for turning or braking, and with the low psi you run on cx and mtb tires, it's like being glued to the dirt. Plus your tires are in more regular contact with the ground so you aren't doing that "micro-skidding" thing.

Ricco's an idiot, Vaughters gets pretty big props for how he's handled the Dennis thing.
formerly dkri
jmdirt

Posts:704

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08/01/2014 10:02 PM
PSI: I run 25 psi on the dirt (tubeless) (I would run less in a wider rim), and 90 on the road (tube) (same) ...great traction (propulsion and braking) and a nice ride. On the dirt I have 2.25 training tires, and 2.1 racing tires (Rocket Ron), but the same psi works well in both even though the volume is different.

dkri, it sounds like yo are a busy man!

Ride on, high psi makes for a rough ride too.

Cosmic Kid

Posts:1113

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08/02/2014 07:07 PM
Dkri - what did you see re: the aero penalty (or lack thereof) for discs on the road?
Just say "NO!" to WCP!!!!
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