Tyres 700x45c to 700x38c

#1
Has anyone done this change. Im looking to go from the gravel crosscut 2 tyres to more free rolling tyres, but have found the available 700x45c are fewer in choice and pretty heavy (those with decent puncture protection).

Ive ordered the marathon greengaurd original in 700x38c mainly to try them out and as they are comparable in weight. I really wanted to try the newest schwalbe energiser plus but not available in Aus and quite hard to get (or very expensive) to get shipped for OS.

Has anyone gone from 45c to 38c (1.75inch wide to 1.5inch wide).
 

E-Wheels

Active Member
#2
Has anyone done this change. Im looking to go from the gravel crosscut 2 tyres to more free rolling tyres, but have found the available 700x45c are fewer in choice and pretty heavy (those with decent puncture protection).

Ive ordered the marathon greengaurd original in 700x38c mainly to try them out and as they are comparable in weight. I really wanted to try the newest schwalbe energiser plus but not available in Aus and quite hard to get (or very expensive) to get shipped for OS.

Has anyone gone from 45c to 38c (1.75inch wide to 1.5inch wide).
Hi Piccoloman
It should be ok
Measure your rim sizes and check the tyre that will fit here; https://www.schwalbetires.com/tech_info/tire_dimensions
 

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#3
Well I got the 700x38c fitted and went for my work commune trip. Compared to the 700x45c both pumped up to 60psi I can report that the thinner tyres do roll a fair bit easier than the oems. Went from a giant crosscut 2 gravel tyre to marathon flatter treaded tyre.
The top speed didn’t change much, maybe 1 or 2kms/hr, but it was the ability to maintain free wheeling and getting up to max speed where I found some difference. They actually feel a bit more direct also, but they are a bit harsher on bumps. Nothing too bad.
All in all I’m glad I made the change.

Ps. I hadn’t changed a bike tyre for 30 years, the standard tyres that came with the bike were harder to get off than I remember.
 

JayVee

Well-Known Member
#4
The difference is that the 45c can run lower PSIs without becoming too unpredictable. The green guard 38c requires a higher PSI or the walls tend to cave in with sharp turns. I would not recommend it to anyone who wants to run low PSIs. Off road there is a lot of rolling resistance due to the puncture protection and need to maintain fairly high PSI.

One other thing I don’t like about the 38C green guards Is that the tire develops bumps and notches over time. This causes unpleasant vibrations. I suppose this is a factor of the puncture protection, but it’s really odd having lumpy wheels with a sine wave form running on top. It's not just imaginary, you can actually see the little wavelets on the tires. It happens after about 4000 kilometres. The semi OCD in me finds it to be slightly annoying.