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


Go Back   > > >

Northern California Northern California

User Tag List

Reply
 
Thread Tools Search this Thread
Old 01-15-09, 04:41 PM   #1
Lanceoldstrong
Family, Health, Cycling
Thread Starter
 
Lanceoldstrong's Avatar
 
Join Date: Feb 2008
Location: Concord, CA
Bikes: Roubaix S-Works, Univega Gran Turismo
Posts: 1,519
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Acceleration Junkies: Ski Jump Thread

Pete introduced me to what he called the Ski Jump in San Francisco last summer. A hair raising descent down California St. toward Embarcadero Bart if I remember right.

What is your favorite ski jump?


Here is my local Ski Jump:
A 15% grade starts things off in a hurry. Acceleration to 50 MPH is possible in just 1400 linear feet. Yipeee!!

My best is 46 MPH but I am working on it.


East bound Muir Rd. in Martinez along HWY 4 where Muir meets Pacheco Blvd.


Last edited by Lanceoldstrong; 01-15-09 at 04:45 PM. Reason: East not west oops
Lanceoldstrong is offline   Reply With Quote
Old 01-15-09, 04:54 PM   #2
johnny99
Senior Member
 
Join Date: Apr 2005
Location: Northern California
Bikes:
Posts: 10,590
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
I've gotten up to 50mph on Los Trancos Road in Portola Valley. It's a smooth, moderately steep road with a long run out at the end.

The steepest downhill that I do regularly is Conzelman Road in the Marin Headlands (heading west). It is steep for a good distance, but it is so steep and winding that most people are too afraid to build up much speed.
johnny99 is offline   Reply With Quote
Old 01-15-09, 05:09 PM   #3
silentben
Senior Member
 
silentben's Avatar
 
Join Date: Jun 2007
Location: Los Gatos, CA
Bikes: 2006 Cannondale Synapse carbon 2
Posts: 889
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Crestview going southbound. Steep and wide and not very twisty so theoretically you should be able to go all out without hitting any brakes. But there's a stop sign 1/3 of the way down and the pavement is pretty bumpy. You can still hit 50 without too much trouble though.
silentben is offline   Reply With Quote
Old 01-15-09, 05:21 PM   #4
BlastRadius
Direct Hit Not Required
 
BlastRadius's Avatar
 
Join Date: Nov 2003
Location: San Bruno, CA
Bikes: Leopard DC1, Ridley X-Fire, GT Zaskar 9r
Posts: 6,190
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
In Millbrae, Larkspur between Skyline and Helen Dr is steep and fast. Only problem is the intersection at the bottom is pretty busy and there's not much stopping time if there's traffic there. Oh yeah and the 3-way stop in the middle of the descent is a bummer too (unless you don't mind running it ).

http://maps.google.com/maps?f=q&sour...98311444652903
BlastRadius is offline   Reply With Quote
Old 01-15-09, 05:37 PM   #5
silentben
Senior Member
 
silentben's Avatar
 
Join Date: Jun 2007
Location: Los Gatos, CA
Bikes: 2006 Cannondale Synapse carbon 2
Posts: 889
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
At the risk of suggesting something totally reckless and irresponsible ... it would be fun to have a downhill time trial and/or top speed run on one of these hills some time.

Top speed would best be measured by gps to rule out calibration difference between wheel-revolution based computers.
silentben is offline   Reply With Quote
Old 01-15-09, 05:48 PM   #6
johnny99
Senior Member
 
Join Date: Apr 2005
Location: Northern California
Bikes:
Posts: 10,590
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 10 Post(s)
Quote:
Originally Posted by silentben View Post
Crestview going southbound. Steep and wide and not very twisty so theoretically you should be able to go all out without hitting any brakes. But there's a stop sign 1/3 of the way down and the pavement is pretty bumpy. You can still hit 50 without too much trouble though.
Anyone who tries that is trying out for a Darwin award. There is a stop sign at the bottom of Crestview and moderately heavy cross traffic that does not stop. A good "ski jump" road needs to have a long run out at the bottom (like 1 mile of flat road with no stop signs). You cannot stop a bicycle from 50mph to 0 in just a few seconds with your hand brakes.
johnny99 is offline   Reply With Quote
Old 01-15-09, 05:54 PM   #7
bigbossman 
Dolce far niente
 
bigbossman's Avatar
 
Join Date: Dec 2004
Location: Northern CA
Bikes:
Posts: 10,777
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Not exactly a ski-jump, and not exactly local, but - the descent off of Sagehen Summit southeast of Mono Lake. It is about a 10 mile roll-out in high desert, with altitude and sweeping, unobstructed vistas.

The upper half is a big sweeping curve, followed by a few rollers. Then the second half drops off down into a red rock canyon, so you get a relatively straight roll with excellent sight lines and (usually) no wind It is in the second part of this descent that you can easily hit 50-60mph coasting, if the conditions are right. My personal best is 56mph.

The trace:


The big sweeping curve is out of frame to the left, the rollers are about where the visible road disappears, and the dark ridges just beyond that that hide where the real fun lies:

__________________
"Love is not the dying moan of a distant violin, itís the triumphant twang of a bedspring."

S. J. Perelman
bigbossman is offline   Reply With Quote
Old 01-15-09, 05:55 PM   #8
gpelpel
Senior Member
 
gpelpel's Avatar
 
Join Date: Nov 2003
Location: Lafayette, CA
Bikes: Time VXRS, Specialized Stumpjumper FSR
Posts: 2,542
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rheem between Orinda and Moraga: my max is 47 mph.
Pig Farm Hill (westbound) in Martinez: max at 49 mph.

Too gradual to be a ski jump but a lot of fun is Monitor Pass in the Sierra: max at 51 mph.
gpelpel is offline   Reply With Quote
Old 01-15-09, 05:55 PM   #9
JTGraphics
Senior Member
 
JTGraphics's Avatar
 
Join Date: Dec 2006
Location: So Cal
Bikes:
Posts: 2,673
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
We do 44 -45 regularly down some short decent of 6 -7 % grades fastest was 49 mph I seem to spin out around that speed using 53x12
__________________
It may not be fancy but it gets me were I need to go.
http://www.jtgraphics.net/cyclist_bicycles.htm
JTGraphics is offline   Reply With Quote
Old 01-15-09, 06:12 PM   #10
silentben
Senior Member
 
silentben's Avatar
 
Join Date: Jun 2007
Location: Los Gatos, CA
Bikes: 2006 Cannondale Synapse carbon 2
Posts: 889
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I guess I should clarify that I stop at all stop signs. You can hit 50 on the bottom portion of Crestview (between Brittan and Edgewood) and still stop in time for the final stop sign because the slope does flatten out at the bottom.

I think if you choose to run the stop sign the cross traffic will be less of a concern than the fact that Crestview doesn't continue past Edgewood
silentben is offline   Reply With Quote
Old 01-15-09, 06:30 PM   #11
silentben
Senior Member
 
silentben's Avatar
 
Join Date: Jun 2007
Location: Los Gatos, CA
Bikes: 2006 Cannondale Synapse carbon 2
Posts: 889
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I got curious about braking distances on a bike. The wikipedia article states you can get 0.5g of deceleration out of the front brake before you hit your limiting factor of pitching over the handlebars. Let's say that out in the real world you're actually applying a constant 0.3g of braking though. This is 2.95 m/s^2 (9.82 m/s^2 * 0.3)

Say you're cruising along at 50mph (22.4 m/s) and you need to come to a full stop. This will take 7.6 seconds (22.4 m/s divided by 2.95 m/s^2). During that time your average speed is 11.2 m/s and so you travel about 85 meters (11.2*7.6). This is a little over 0.05 miles.

Of course that assumes you're on level ground. Maybe double that stopping distance if you're going down a reasonable (6-7%) hill? That's still just a tenth of a mile to go from 50mph to zero.
silentben is offline   Reply With Quote
Old 01-15-09, 07:41 PM   #12
ConstantRider
Senior Member
 
Join Date: Jan 2006
Bikes:
Posts: 477
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by johnny99 View Post
The steepest downhill that I do regularly is Conzelman Road in the Marin Headlands (heading west). It is steep for a good distance, but it is so steep and winding that most people are too afraid to build up much speed.
I am one of the afraid people on this road -- how fast do you get going on it?

For less scary descending, Red Hill going north to south (i.e., from Petaluma toward Marin) is a great stretch to try to achieve maximum speed on. Then, just a short while later, there's the descent on Point Reyes Petaluma toward Nicasio. Both are long downhills with only the most gradual of turns, and also long flat stretches at the bottom to decelerate safely on.
ConstantRider is offline   Reply With Quote
Old 01-15-09, 08:11 PM   #13
x136 
phony collective progress
 
x136's Avatar
 
Join Date: Sep 2006
Location: San Hoosey
Bikes: http://velospace.org/user/36663
Posts: 2,981
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
That section of Highway 1 (going North) right before Tunitas Creek is always a pretty good recipe for mid-40s or so. Never a problem taking the lane to cross that bridge, that's for sure.
__________________
x136 is offline   Reply With Quote
Old 01-15-09, 08:44 PM   #14
Beaker
moth -----> flame
 
Beaker's Avatar
 
Join Date: Dec 2007
Location: SF Bay Area
Bikes: 11 CAAD 10-4, 07 Specialized Roubaix Comp, 98 Peugeot Horizon
Posts: 5,907
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
For me - South Park Drive in Tilden FTW. Easy to exceed 50mph even with braking, that straight part in the middle is the key:

http://www.bikely.com/maps/bike-path...uth-Park-Drive

Good news is it's quiet, with not many cars, generally wide turns and smooth tarmac. Unfortunately it's closed until Mar or Apr to protect migrating newts...
__________________
BF, in a nutshell
Beaker is offline   Reply With Quote
Old 01-15-09, 08:45 PM   #15
msincredible
crazy bike girl
 
msincredible's Avatar
 
Join Date: Jul 2007
Location: CA Central Coast
Bikes: '07 Orbea Onix, '07 Birdy Yellow, '06 Cannondale Bad Boy (stolen)
Posts: 3,325
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I passed a truck on Edgewood in the shoulder at 45 mph...drafting it let me get up to that speed (usually I can get up to about 40 if I don't have my jacket on).
__________________
Countries I've ridden in: US, Canada, Ireland, UK, Germany, Netherlands, France, China, Singapore, Malaysia
States I've ridden in: Illinois, Connecticut, Massachusetts, Pennsylvania, California, Nevada, Missouri, Colorado
msincredible is offline   Reply With Quote
Old 01-15-09, 08:53 PM   #16
powpow
Senior Member
 
powpow's Avatar
 
Join Date: Jan 2005
Location: Berkeley, CA
Bikes:
Posts: 1,075
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
South Park Drive in the Berkeley hills will get you going. After a few curves there is a long, straight, fast section with good pavement. Good climb too.

http://www.calcycling.org/?q=node/367#southpark
powpow is offline   Reply With Quote
Old 01-15-09, 08:54 PM   #17
msincredible
crazy bike girl
 
msincredible's Avatar
 
Join Date: Jul 2007
Location: CA Central Coast
Bikes: '07 Orbea Onix, '07 Birdy Yellow, '06 Cannondale Bad Boy (stolen)
Posts: 3,325
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Bonny Doon is a nice fast descent too...got up over 40 mph on my old hybrid there.
__________________
Countries I've ridden in: US, Canada, Ireland, UK, Germany, Netherlands, France, China, Singapore, Malaysia
States I've ridden in: Illinois, Connecticut, Massachusetts, Pennsylvania, California, Nevada, Missouri, Colorado
msincredible is offline   Reply With Quote
Old 01-15-09, 09:13 PM   #18
Beaker
moth -----> flame
 
Beaker's Avatar
 
Join Date: Dec 2007
Location: SF Bay Area
Bikes: 11 CAAD 10-4, 07 Specialized Roubaix Comp, 98 Peugeot Horizon
Posts: 5,907
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by powpow View Post
South Park Drive in the Berkeley hills will get you going. After a few curves there is a long, straight, fast section with good pavement. Good climb too.

http://www.calcycling.org/?q=node/367#southpark
Great minds think alike

Interesting link, I'm trying to find as many climbs in the area as I can, but I'm not sure I agree with all of the descriptions though - descending Wildcat isn't much fun, huh??? I need to try Marin for the reasons stated though.
__________________
BF, in a nutshell
Beaker is offline   Reply With Quote
Old 01-15-09, 09:34 PM   #19
jonathanb715
Senior Member
 
Join Date: Jan 2007
Location: NorCal
Bikes: Kestrel Talon
Posts: 1,695
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I finally got to go down S. Park in Tilden Regional Park when it was closed to traffic - steep and fast! My computer was out, so I'm not sure how fast I was going. Only a couple of people walking dogs, and no salamanders were hurt on the run. There's a stop sign at the bottom, but it seemed to flatten out and you can see it coming from at least a quarter mile away.

Another oldie but goodie is Palomares going South to North (ie, from Niles Canyon to Castro Valley). Not super steep, but long enough and straight enough to get up close to 50 without trying.

JB
jonathanb715 is offline   Reply With Quote
Old 01-15-09, 09:35 PM   #20
jonathanb715
Senior Member
 
Join Date: Jan 2007
Location: NorCal
Bikes: Kestrel Talon
Posts: 1,695
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Beaker View Post
Great minds think alike

Interesting link, I'm trying to find as many climbs in the area as I can, but I'm not sure I agree with all of the descriptions though - descending Wildcat isn't much fun, huh??? I need to try Marin for the reasons stated though.
Oh, I have to disagree - descending Wildcat is a lot of fun - just kind of technical, so you get to work on your skills!

JB
jonathanb715 is offline   Reply With Quote
Old 01-15-09, 09:51 PM   #21
Beaker
moth -----> flame
 
Beaker's Avatar
 
Join Date: Dec 2007
Location: SF Bay Area
Bikes: 11 CAAD 10-4, 07 Specialized Roubaix Comp, 98 Peugeot Horizon
Posts: 5,907
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by jonathanb715 View Post
Oh, I have to disagree - descending Wildcat is a lot of fun - just kind of technical, so you get to work on your skills!

JB
No, we're in agreement, it was the link that claimed it wasn't fun.

For South Park, I have to say I prefer the descent when it's open. Climbing is fine year round, but I find because the road is closed to traffic, folks walk across the breadth of the road, often with dogs not expecting to meet anything on wheels. Makes me a bit jittery.
__________________
BF, in a nutshell
Beaker is offline   Reply With Quote
Old 01-15-09, 10:53 PM   #22
kudude
slow up hills
 
kudude's Avatar
 
Join Date: Mar 2006
Location: Seattle, WA
Bikes: Giant TCR, Redline CX, Ritchey Breakaway, Spec S-works epic
Posts: 4,931
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
1) Whoever said Pig Farm hill - I've seen excess of 50, and it has a great runout that takes you onto Bear Creek
http://maps.google.com/?ie=UTF8&laye...59.961462&z=15

2) South park is fun and all, and maybe the fastest, but the one right curve near the top always makes my heart skip a beat. Definitely above 50 mph, though.
http://maps.google.com/?ie=UTF8&laye...59.961462&z=15

3) Wildcat is a blast, in the same way south pinehurst is a blast. You can practice high speed cornering over and over and over and over
http://maps.google.com/?ie=UTF8&laye...59.961462&z=15

4) The backside of papa bear is fast, but really, really long, not much of a ski jump
http://maps.google.com/?ie=UTF8&laye...59.961462&z=15
5) Who doesn't love Claremont?
http://maps.google.com/?ie=UTF8&laye...59.961462&z=15
6) Marin -- you can go 0 to 30 to 0 in the course of a block, for about 6 consecutive blocks
http://maps.google.com/?ie=UTF8&laye...59.961462&z=15
7) Joaquin Miller is fast, plus you get that sign blinking at you telling you you're speeding.
http://maps.google.com/?ie=UTF8&laye...59.961462&z=15
8) If you come back OVER mama bear (from pumphouse), that one will get you flying in a hurry
http://maps.google.com/?ie=UTF8&laye...59.961462&z=15
9) Someone mentioned something about Orinda->Moraga. I don't know if it's the same road, but Orindawoods Drive has got to be one of the steepest uncontrolled (no stop signs/lights) roads around. You can get to it going towards wildcat from el nido ranch road
http://maps.google.com/?ie=UTF8&laye...59.961462&z=15
Any others around the hills in that area that I'm missing?

Last edited by kudude; 01-16-09 at 11:24 AM.
kudude is offline   Reply With Quote
Old 01-15-09, 11:07 PM   #23
Beaker
moth -----> flame
 
Beaker's Avatar
 
Join Date: Dec 2007
Location: SF Bay Area
Bikes: 11 CAAD 10-4, 07 Specialized Roubaix Comp, 98 Peugeot Horizon
Posts: 5,907
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
kudude - two more:

10) Shepherd Canyon the other side of Skyline/Pinhurst is pretty good, there's a nice long straight stretch that can get you well into the 40's - only done that a couple of times.

11) Hiller is pretty insane - I'd put that in the "too steep to be fun" category, as it finishes in a stop sign before becoming Tunnel that put my HR through the roof the other week.
__________________
BF, in a nutshell
Beaker is offline   Reply With Quote
Old 01-15-09, 11:11 PM   #24
powpow
Senior Member
 
powpow's Avatar
 
Join Date: Jan 2005
Location: Berkeley, CA
Bikes:
Posts: 1,075
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Beaker View Post
Great minds think alike

Interesting link, I'm trying to find as many climbs in the area as I can, but I'm not sure I agree with all of the descriptions though - descending Wildcat isn't much fun, huh??? I need to try Marin for the reasons stated though.
Got me by nine minutes!

I agree, Wildcat is a fun descent, though the pavement on some of the lower turns could use some work.
powpow is offline   Reply With Quote
Old 01-15-09, 11:21 PM   #25
kudude
slow up hills
 
kudude's Avatar
 
Join Date: Mar 2006
Location: Seattle, WA
Bikes: Giant TCR, Redline CX, Ritchey Breakaway, Spec S-works epic
Posts: 4,931
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Beaker View Post
kudude - two more:

10) Shepherd Canyon the other side of Skyline/Pinhurst is pretty good, there's a nice long straight stretch that can get you well into the 40's - only done that a couple of times.

11) Hiller is pretty insane - I'd put that in the "too steep to be fun" category, as it finishes in a stop sign before becoming Tunnel that put my HR through the roof the other week.
+1 I forgot about Shepherd Canyon. I don't know if I've ever done Hiler -- is it the steep as **** road if you take a left instead going right up tunnel?
kudude 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 12:58 PM.