John 'Zac' Brennan

I am riding 200 mi for Kahleesi. Please sponsor me and support my challenge to fight kids' cancer and save little lives.

Donate Now

I've Ridden 0.0 mi My goal is 200 mi

My Rankings

National: 544th
State: 15th in CO

I've raised $264 My goal is $500 Donate Now

I'm Riding For

Kahleesi

Kahleesi ride your cool bike! Have fun❤️

My Story

30 Jul 2025

This September 2025I 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 Raised

2020
465 mi Ridden

$1,695 Raised

2021
519 mi Ridden

$2,266 Raised

2022
546 mi Ridden

$6,000 Raised

2023
565 mi Ridden

$4,500 Raised

2024
Ridden

$264 Raised

2025

2,610 mi

Ridden

$16,802

Raised

My Challenge

$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 13 hours 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 14 hours ago

My Sponsors

Patricia O’Leary

“Way to go, Little Dear! Another year riding for a great cause! ♥️”
$103.50
Received this donation 13 hours ago

John

“Thank you Little Dear❤️”

Thank you Little Dear❤️
Greg Krallman

“Those who help others while facing their own challenges… now that’s LOVE Go gettem Zac”
$72.45
Received this donation 14 hours ago

John

“Thanks Greg! Are you home yet?”

Thanks Greg! Are you home yet?
Susan Teuton

“Way to go Zac!!”
$36.23
Received this donation 8 days ago

John
John 'Zac' Brennan

“I’ve decided to ride for the Children’s Cancer Research Fund again this September. And so the first donation is from me.”
$51.75
Received this donation 10 days ago

John