John 'Zac' Brennan
- National: 315th
- State: 8th in CO
- My Team: 6th
I'm Riding For
Kahleesi
Kahleesi ride your cool bike! Have fun❤️
My Story
This September 2026 I am taking part in the Great Cycle Challenge to fight kids' cancer!
Cancer research funding has been recently defunded by the current administration in Washington. Now, more than ever the children née our help.
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 76, have Stage IV 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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534 mi Ridden$4,240 Raised2025
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220 mi Ridden$3,102 Raised2026
My Challenge
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20.4 mi ride - Into the sunset - Wednesday, September 16, 2026
Logged this ride 7 hours ago -
25.3 mi ride - Bartholomew Lane - Monday, September 14, 2026
Logged this ride 1 day ago -
Saturday, September 12 ride
13 Sep 202627 mile loop from our campsite through area mountains. Windy! Elevation gain of 2,041 feet. Scenic.
Posted 4 days ago -
27.0 mi ride - Clark loop - Saturday, September 12, 2026
Logged this ride 4 days ago -
19.6 mi ride - Columbine - Friday, September 11, 2026
Logged this ride 4 days ago -
27.2 mi ride - Bartholomew lane+ - Thursday, September 10, 2026
Logged this ride 4 days ago -
5.0 mi ride - Flat tire - Thursday, September 3, 2026
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 6 days ago -
33.0 mi ride - Home-Mt. Harris Canyon -Downtown Steamboat Springs-Home - Thursday, September 3, 2026
Logged this ride 13 days ago -
20.0 mi ride - Twilight Time - Wednesday, September 2, 2026
Logged this ride 14 days ago
My Sponsors
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Kick Cancer's Butt Day matched donation
$450.02Received this donation 7 days ago
John
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Pat O’Leary
$207Received this donation 2 days ago
John
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Christopher Flanagan
$103.50Received this donation 37 days ago
John
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Donald Carluccio
$103.50Received this donation 8 days ago
John
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Anonymous
$103.50Received this donation 7 days ago
John
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Greg Krallman
$103.50Received this donation 25 days ago
John
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Jeff and Gloria Halliday
$103.50Received this donation 10 hours ago -
Joe Huselton
$103.50Received this donation 7 days ago
John
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Lura Briscoe
$103.50Received this donation 26 days ago
John
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Mike & Cindy Ruzicka
$103.50Received this donation 27 days ago
John
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Rob Dilldine
$103.50Received this donation 27 days ago
John
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Rob Wilmoth
$103.50Received this donation 8 days ago
John
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TBH Plumbing & Heating
$103.50Received this donation 6 days ago
John
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TIMOTHY ANDERSON
$103.50Received this donation 16 hours ago
John
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Tom Raushenbush
$103.50Received this donation 7 days ago
John
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Wayne and Lisa Adamo
$103.50Received this donation 8 days ago
John
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Zachary Schaefer
$103.50Received this donation 1 day ago
John
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Facebook Fundraiser Donation
$103Received this donation 17 days ago
John
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Tom Schreiber
$100Received this donation 32 days ago
John
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Alison Carroll
$51.75Received this donation 16 days ago
John