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The Knoxville Double Century


Registration for the 2024 Knoxville Double Century will open in the late spring or summer of 2024. 

Route Description

Special note about opening and closing times for the Knoxville Double Century. 


We will open the route officially at 3:30 am and it will officially close at Midnight.  In the past the close time was a soft end time.  Due to insurance constraints we can no longer do this.  This is also in consideration for our volunteers who put in long hours both before and the day of these events.  With that being the case we have to maintain a hard cut off time.  If you are still on the course at midnight you will not receive credit as an official finisher and will be asked to SAG to the finish.  If you insist on proceeding  you will not have support and will be asked to surrender your rider number.  The time limit is generous for this event, it allows for over 20 hours to complete the route.  If you cannot complete a double century in less then 20 hours total time we would recommend that  you consider not riding the event as it is a moderately to highly challenging route with over 12,500 feet of climbing.

Over the past few years, the overall condition of Knoxville Road along the northwest side of Lake Berryessa and up to Lower Lake has degraded to the point that it is not currently safe to send cyclists or support vehicles up the route toward Lower Lake.  As a result, the ride uses a nicer section of Knoxville Road in the second half of the ride.  There is only one ride option with roughly 12,500 feet of elevation gain.

The new route was well received by the riders last year so we will continue to use this route going forward.  The route is just over 200 miles in length with an elevation gain of just over 12,800 feet. ​

The route will now start in Fairfield and begin with some mild rolling hills to warm up.  After making a sharp left turn on Hwy 121 you will start to climb Mt George for the first serious climbing of the day. Once you hit the top, there is a fast somewhat technical descent into the Napa Valley.  At this point you will have some flatter sections of pavement as you head to the first rest stop just off of the Silverado Trail. 

​After refueling and filling your water bottles you will return to the Silverado Trail and head to the longest climb of the day on Deer Park Trail. This climb is approximately 7.5 miles long with just over 1700 feet of climbing as it takes you from St. Helena to Angwin. You are rewarded with a long descent once you reach the peak.  Extreme caution should be used though on the descent.   It is steep and has many off camber turns where going slow is the best course of action.  At the bottom of the descent, the route changes from previous years as you turn left on Pope Valley Rd rather than going right.  The second rest stop will be just after this turn at the Pleasant Valley Fire Department.  You will need to make sure you refuel and fill up on water as the route will then take you up Butts Canyon Road toward Middletown and the lunch stop which is over 30 miles away. 


Once you leave the second rest stop you will have two small climbs between the rest stop at the fire department and Hwy 29 on Butts Canyon Road.  There is also a much more difficult climb on ​Spruce Grove Road.  Spruce Grove Road is just under 9 miles in length.  On this stretch you will ascend over 900 feet most of which is gained on the first 3 miles after turning onto Spruce Grove, at the turn be ready to shift into a lower gear as the climb comes suddenly.  The climb slowly gets shallow as you near the peak about 4 or so miles into this stretch.  At the peak you will be rewarded with a nice descent back to Hwy 29 where you will be just a short distance from the lunch stop at Lower Lake Park.

​After lunch you will again rejoin Hwy 29 as you make a left turn heading back toward Middletown.  This is the same section of Hwy 29 used in previous editions of the Knoxville Lowland route.  After getting to Middletown, you head back toward the Pleasant Valley Fire Department again for your 4th rest stop.

Immediately after leaving the fourth rest stop, you will turn left on Pope Valley Cross Road and head out toward Knoxville Rd.  You will be treated in this section of the route to 9 miles of rural riding with mild to moderately rolling terrain.  Soon you will be at the corner of Knoxville and Berryessa-Knoxville Roads.  There will not be a rest stop on this corner as in years past however there are restrooms if you need them.  This will be a familiar area as in years past this was used prior to heading toward Lower Lake on Knoxville Road.  Instead of heading north up Knoxville Rd as we had in previous years, riders will turn right and head southeast down Berryessa-Knoxville Road toward Spanish Flat and the Hwy 128 intersection at Turtle Rock Bar.  You will then take a right onto Hwy 128 as you head out to Moore Creek Park for your next rest stop. 


Please remember to eat and fill up at Moore Creek Park.  There should be warm food at this stop plus snacks which you can pack for the remainder of the ride.  After leaving Moore Creek Park, you are back on the traditional route as you climb the back side of Cardiac Hill and descend past Monticello Dam at Lake Berryessa.  There will be one last rest stop at mile 180 at the Putah Creek Trailhead.  From this stop  you will turn right onto Pleasants Valley Road toward Vacaville followed by 3 to 4 miles of easy rollers back to the ride start finish.


The following rules will result in a disqualification from our cycling events.  It is unfortunate that we need to have these specific rules however they are essential to protect the event, the volunteers and those who are participating on our rides. 


1. Under no circumstances are personal support vehicles allowed on our events.  


2. All participants and volunteers must sign a waiver prior to participating in our events or as a volunteer.  


3. If you are deemed unsafe from continuing on the ride you will be removed from the course.


4. Support will only be provided to registered riders.  If an unregistered rider is found to be participating on the event they will be asked to refrain from using our support.  If a registered rider is riding with a "friend" who has not registered they will be disqualified from receiving credit as an official finisher on the event. 




We, the Quacks! (or officially, the Quackcyclists) are a group of friends & riders who would like to give something back to riders everywhere who have provided companionship, support, and overall good times for us on so many other great rides. We ride for fun, we ride for the challenge, we ride for the fellowship.


We have decided to work together for the purpose of organizing, promoting, supporting long distance cycling events.  The Quackcyclists may also engage in other cycling related activities, and agree that no matter what, their friendship and loyalty to each other is more important than any activity, event, or situation they may find themselves in.


Quacks don’t take themselves too seriously, but we do take what we do seriously. It’s about friendship, loyalty, enjoying and appreciating life, and giving back to others for the blessings we have received.

In all our years, our most requested products have been from Hammer Nutrition. They have been a huge support to all our events over the years and we are very grateful to them again this year. You can find out more information about their products on their website.




Tim and Tracy Bartoe


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