John 'Zac' Brennan
I am riding 200 miles for Kahleesi. Please sponsor me and support my challenge to fight kids' cancer and save little lives.
I've Ridden
146.0 mi
My goal is
300 mi
My Rankings
- National: 227th
- State: 7th in CO
I'm Riding For
Kahleesi
Kahleesi ride your cool bike! Have fun❤️
My Story
3 Aug 2025
This September 2025 I am taking part in the Great Cycle Challenge to fight kids' cancer!
Why? Because right now, cancer is the biggest killer of children from disease in the United States. Over 15,700 children are diagnosed every year, and sadly, 38 children die of cancer every week.
Kids should be living life, not fighting for it.
So I am raising funds through my challenge to help these kids and support Children's Cancer Research Fund to allow them to continue their work to develop lifesaving treatments and find a cure for childhood cancer.
Please support me by making a donation to give these kids the brighter futures they deserve. I'm also riding for myself. In Vietnam in the Army I was exposed to Agent Orange herbicide and now at 75, have Stage IV metastatic prostate cancer.
Your support will change little lives.....and mine too!
Thank you.
John Zac Brennan
My Legacy
Here's my personal impact over 6 years to fight kids' cancer and save little lives.
-
514 mi Ridden$2,077 Raised2020
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465 mi Ridden$1,695 Raised2021
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519 mi Ridden$2,266 Raised2022
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546 mi Ridden$6,000 Raised2023
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565 mi Ridden$4,500 Raised2024
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146 mi Ridden$2,249 Raised2025
2,756 mi
Ridden
$18,787
Raised
My Challenge
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16.8 mi ride - Camp to Fetcher’s Barn loop - Sunday, September 14, 2025
Logged this ride 2 days ago -
19.5 mi ride - Camp to Columbine Fork - Friday, September 12, 2025
Logged this ride 4 days ago -
12.5 mi ride - Campsite to Firehouse - Wednesday, September 10, 2025
Logged this ride 4 days ago -
$2,500 raised to fight kids' cancer!
I just raised $2,500 to fight kids' cancer and achieved SUPERHERO LEVEL in the challenge! Thank you so much for your support.
Posted 5 days ago -
17.7 mi ride - Our campsite to Fetcher’s cabin - Wednesday, September 10, 2025
Logged this ride 6 days ago -
$2,000 raised to fight kids' cancer!
I just raised $2,000 to fight kids' cancer and achieved LEGEND LEVEL in the challenge! Thank you so much for your support.
Posted 6 days ago -
20.3 mi ride - Pearl Lake campsite to Columbine - Tuesday, September 9, 2025
Logged this ride 6 days ago -
20.0 mi ride - 40 - Haymaker Golf Course - Saturday, September 6, 2025
Logged this ride 9 days ago -
26.0 mi ride - 14 - 22 and back - Friday, September 5, 2025
From Home to Home
Logged this ride 10 days ago -
7.5 mi ride - Fetcher Pond - Wednesday, September 3, 2025
To Home
Logged this ride 13 days ago
My Sponsors
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Kick Cancer's Butt Day matched donation
“Here's your matched donation from a group of wonderful Children's Cancer Research Fund supporters. THANK YOU so much for your awesome efforts to kick cancer's butt!”
$1,051.34Received this donation 5 days ago
John
“Thank you anonymous donors!”
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Dennis and Kathy Dougherty
“" You the Man" May all your hills be "down-hill" XOXO”
$155.25Received this donation 30 days ago
John
“Thank you Dennis. The kids appreciate your support.☮️😎”
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Rob Wilmoth
“Zac, Thanks for all the voodoo that you do! The kids are certainly lucky to have you in their corner. Rob”
$155.25Received this donation 6 days ago
John
“Thank you Rob. It is getting harder each year but I still dig riding a bike for a great cause!☮️❤️”
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Anne Krallman
“Zac , I am so PROUD of you !!!”
$124.20Received this donation 34 days ago
John
“Thank you Anne for your generous support !”
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Joe Huselton
“Go Zach”
$124.20Received this donation 6 days ago
John
“Thank you Paula and Joe! You’re the best!”
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Michael/Esther Belz
“way to go “cuz”. good Luck”
$124.20Received this donation 5 days ago
John
“Thank you Cousins! We had a great Match Day. Over 1.8 million dollars came in. My donations were over $1,000. My current total is now $4,038 dollars.”
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Christopher Flanagan
$103.50Received this donation 5 days ago
John
“Thank you Chris and Vicki. We raised $1,850,000 yesterday. I raised $1,000 and received matching dollars, I’m up over $4,000 now. The heat is off, now I can breathe easier and enjoy my rides!”
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Dan O'Neill
“You've got this!”
$103.50Received this donation 6 days ago
John
“Thank you Dan, you’re the best!”
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Dan O'Neill
“You got this!”
$103.50Received this donation 5 days ago -
Anonymous
$103.50Received this donation 19 days ago
John
“Thank you very much for your support. The kids need all of us to pitch in. Zac”
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Mike Ruzicka
“Thanks for doing all you can to help in the battle. Hope to see you at next week’s meeting.”
$103.50Received this donation 33 days ago
John
“Thank you Mike for your help! Kids with cancer deserve healthy lives. They should be riding their own bikes!☮️”
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Patricia O’Leary
“Way to go, Little Dear! Another year riding for a great cause! ♥️”
$103.50Received this donation 46 days ago
John
“Thank you Little Dear❤️”
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timothy anderson
“Zak. The man, the myth, the legend. Keep on peddling my friend.”
$103.50Received this donation 11 days ago
John
“Thank you, Tim. As I have said in the past, you’re all right.”
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Wayne and Lisa Adamo
“Go Zac! So glad you're doing this! Wayne and Lisa”
$103.50Received this donation 6 days ago
John
“Thank you WALA! The researchers are pleased to be getting the help they need from all of us. Kids cancer sucks.”
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Mitch Godfrey
“Great to see a fellow Vietnam Veteran ride 200 miles!”
$100Received this donation 32 days ago
John
“Thank you Mitch! Welcome home!!”
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Rob Dilldine
$100Received this donation 24 days ago
John
“Thank you Rob for your generosity. The kids need all the research possible to develop cures for their terrible cancers. ☮️❤️”
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Ergo Construction Inc.
“Bless you Brother!”
$72.45Received this donation 6 days ago
John
“Thank you James and Kaela❤️”
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Greg Krallman
“Those who help others while facing their own challenges… now that’s LOVE Go gettem Zac”
$72.45Received this donation 46 days ago
John
“Thanks Greg! Are you home yet?”
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Jen Havely
“Happy to support this great cause! Wishing you all the best on your challenge!”
$72.45Received this donation 33 days ago
John
“Thank you, Jen for your support. The research needs to be done. It looks like it’s up to us to support the researchers. The government has backed out of it. Thank you again.”
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Mark Lobstein
“Thanks again Zac for the reminder. Keep doing that great work in bringing awareness for these precious souls. Love you brother!”
$72.45Received this donation 7 days ago
John
“Thank you Mark for your continued support for the kids. Washington cut research funding and that further complicates matters. We all need to step up. Be safe . I love you like Doug’s brother 😎☮️❤️”