Can You Fit 28mm Tyres on a Giant Propel? Real-World Test & Verdict!

In this video, I take on a practical and honest challenge: can a 28mm tire fit on a 2014 Giant Propel road bike that normally runs 23mm tires?

The motivation behind this test comes from real-world riding needs rather than theory. With an upcoming Ironman Wales triathlon, I want to improve comfort and performance on rough UK and Welsh roads, where wider tires are increasingly recommended by tire manufacturers.

The video walks through the entire process step by step, from explaining the current bike setup and brake clearance, to physically fitting the 28mm tire, calculating tire pressure, and taking the bike out for multiple real-world test rides. Along the way, I highlight issues such as brake clearance, tire rub under braking, pressure inconsistencies from online calculators, and the noticeable difference between budget tires and high-quality performance tires.

After several rides, brake adjustments, and tire upgrades, the video reaches a clear and useful conclusion: with good-quality tires and the right brake setup, it is possible to run 28mm tires on a Giant Propel. This video is especially helpful for cyclists, triathletes, and Ironman athletes who are considering wider tires for comfort without sacrificing safety or compatibility. Can You Fit 28mm Tires on a Giant Propel? Real-World Test & Verdict!


🧐 What You'll Learn in This Video:
Whether a 28mm tire can fit on a 2014 Giant Propel
Differences between 25mm and 28mm tires in real riding conditions
Brake clearance challenges and solutions
Tire pressure calculations and real-world settings
Road test results on rough terrain and strong wind
Why high-quality tires provide better clearance and performance
Final verdict for Ironman and long-distance riding



⏱ Video timestamps:
0:00 – Introduction and the 28mm tire challenge
0:18 – Current brake setup and clearance explanation
0:53 – Why wider tires are better for rough UK roads
1:10 – Chain removal and bike cleaning
1:26 – Installing the 28mm tire and checking clearance
2:06 – First impressions of the tire quality
2:40 – Tire pressure calculations and PSI discussion
3:38 – First outdoor test ride
4:11 – Rear tire fit confirmation on the Giant Propel
4:53 – Brake rub issue and possible solutions
5:26 – Brake pad and tire upgrade update
6:47 – Final long ride before Ironman Wales
7:00 – Four-hour field test and riding impressions
7:54 – Final verdict: fitting 28mm tires on a Giant Propel
8:11 – Subscribe message and Ironman training plan mention

🤩 Share your own experiences with wider tires in the comments below, especially if you’ve tested them on older aero frames. Let’s help each other make better bike setup decisions.

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