John 'Zac' Brennan
- National: 174th
- State: 6th in CO
I'm Riding For
Kahleesi
Kahleesi ride your cool bike! Have fun❤️
My Story
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
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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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Ridden$1,462 Raised2025
My Challenge
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7.5 mi ride - Fetcher Pond - Wednesday, September 3, 2025
To Home
Logged this ride 10 hours ago -
19.0 mi ride - River Road-Hwy 131-Hwy 40 - Wednesday, September 3, 2025
Logged this ride 12 hours ago -
24.9 mi ride - River Road - Monday, September 1, 2025
Logged this ride 12 hours ago -
28.3 mi ride - River Road - Monday, September 1, 2025
Logged this ride 2 days ago -
$1,000 raised to fight kids' cancer!
I just raised $1,000 to fight kids' cancer and achieved WARRIOR LEVEL in the challenge! Thank you so much for your support.
Posted 18 days ago -
$500 raised to fight kids' cancer!
I just raised $500 to fight kids' cancer and achieved GUARDIAN LEVEL in the challenge! Thank you so much for your support.
Posted 27 days ago -
$250 raised to fight kids' cancer!
I just raised $250 to fight kids' cancer and achieved PROTECTOR LEVEL in the challenge! Thank you so much for your support.
Posted 34 days ago -
$100 raised to fight kids' cancer!
I just raised $100 to fight kids' cancer and achieved DEFENDER LEVEL in the challenge! Thank you so much for your support.
Posted 34 days ago
My Sponsors
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Dennis and Kathy Dougherty
“" You the Man" May all your hills be "down-hill" XOXO”
$155.25Received this donation 18 days ago
John
“Thank you Dennis. The kids appreciate your support.☮️😎”
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Anne Krallman
“Zac , I am so PROUD of you !!!”
$124.20Received this donation 21 days ago
John
“Thank you Anne for your generous support !”
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Anonymous
$103.50Received this donation 7 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 21 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 34 days ago
John
“Thank you Little Dear❤️”
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Mitch Godfrey
“Great to see a fellow Vietnam Veteran ride 200 miles!”
$100Received this donation 20 days ago
John
“Thank you Mitch! Welcome home!!”
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Rob Dilldine
$100Received this donation 12 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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Greg Krallman
“Those who help others while facing their own challenges… now that’s LOVE Go gettem Zac”
$72.45Received this donation 34 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 20 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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Facebook Fundraiser Donation
$56.62Received this donation 27 days ago
John
“Thank you for your help!!”
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Amy Triandiflou & Jesse Hull
“Push those pedals Zac! Happy to support you and this important cause.”
$51.75Received this donation 6 hours ago
John
“Thanks guys! How’s your new house?”
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Patty Early
“It’s heartbreaking that cancer can affect so many innocent young children. Thanks for committing to the Great Cycle Race to generate funds to support these children. Good luck!! And be safe!”
$51.75Received this donation 15 days ago
John
“Thank you for your help Patty. It was great seeing you and Hobey! ☮️❤️ Zac Brennan”
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Anonymous
“We will need all the help we can get to fight cancer with RFK in there tRump! Good luck!! Kick some ass!!”
$51.75Received this donation 18 days ago
John
“Thank you Alison (or anonymous). The kids need our help. Uncle Jack Zac”
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Facebook Fundraiser Donation
$51.52Received this donation 29 days ago
John
“Thank you for your support. John Zac Brennan”
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Facebook Fundraiser Donation
$50Received this donation 27 days ago
John
“Thanks so much for your help and support. The kids deserve to lead healthy lives happy lives thank you again. Zac Brennan”
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Facebook Fundraiser Donation
$45Received this donation 29 days ago
John
“Thank you so much. Zac Brennan”
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Facebook Fundraiser Donation
$40Received this donation 27 days ago
John
“Thank you so much for your support. The kids deserve our love and support ❤️ Zac Brennan”
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Barbara Novey
“Hey Zac, glad you see you’re still out there doing what needs to be done for both yourself and the kids”
$36.23Received this donation 17 days ago
John
“Thank you Bobby ❤️”
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Susan Teuton
“Way to go Zac!!”
$36.23Received this donation 41 days ago
John
“Thank you Susan ❤️”
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Facebook Fundraiser Donation
$5Received this donation 29 days ago
John
“Thank you for your support. Zac Brennan”