John 'Zac' Brennan

- National: 199th
- State: 5th 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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534 mi Ridden$4,240 Raised2025
My Challenge
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40.6 mi ride - Rabbit Ears base to Service Creek to Home - Tuesday, September 30, 2025
Logged this ride 11 hours ago -
29.8 mi ride - Rabbit Ears base to Rd22 to River Rd - Monday, September 29, 2025
Logged this ride 1 day ago -
37.6 mi ride - Whitewood - Sunday, September 28, 2025
Logged this ride 2 days ago -
38.3 mi ride - River Road to Service Creek - Saturday, September 27, 2025
Logged this ride 3 days ago -
41.4 mi ride - Rabbit Ears base to Service Creek to River Road - Friday, September 26, 2025
Logged this ride 4 days ago -
39.2 mi ride - Catamount Lake loop - Tuesday, September 23, 2025
Logged this ride 6 days ago -
39.6 mi ride - Camp to Tom’s to Clark Store around Steamboat Lake - Sunday, September 21, 2025
Logged this ride 10 days ago -
19.6 mi ride - Campsite to Columbine Fork - Friday, September 19, 2025
Logged this ride 11 days ago -
16.4 mi ride - Camp to Clark Store - Thursday, September 18, 2025
Logged this ride 12 days ago -
18.8 mi ride - Camp to Tanglewood - Wednesday, September 17, 2025
Logged this ride 13 days ago
My Sponsors
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Kick Cancer's Butt Day matched donation
$1,051.34Received this donation 20 days agoJohn
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Dennis and Kathy Dougherty
$155.25Received this donation 45 days agoJohn
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Rob Wilmoth
$155.25Received this donation 21 days agoJohn
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Anne Krallman
$124.20Received this donation 48 days agoJohn
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Joe Huselton
$124.20Received this donation 20 days agoJohn
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Michael/Esther Belz
$124.20Received this donation 20 days agoJohn
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Christopher Flanagan
$103.50Received this donation 20 days agoJohn
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Dan O'Neill
$103.50Received this donation 21 days agoJohn
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Dan O'Neill
$103.50Received this donation 20 days ago -
Anonymous
$103.50Received this donation 34 days agoJohn
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Mike Ruzicka
$103.50Received this donation 48 days agoJohn
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Patricia O’Leary
$103.50Received this donation 61 days agoJohn
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timothy anderson
$103.50Received this donation 25 days agoJohn
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Wayne and Lisa Adamo
$103.50Received this donation 21 days agoJohn
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Mitch Godfrey
$100Received this donation 47 days agoJohn
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Rob Dilldine
$100Received this donation 39 days agoJohn
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Ergo Construction Inc.
$72.45Received this donation 20 days agoJohn
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Greg Krallman
$72.45Received this donation 61 days agoJohn
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Jen Havely
$72.45Received this donation 48 days agoJohn
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Mark Lobstein
$72.45Received this donation 21 days agoJohn