gavroche
Getting old but not past it
- Location
- North Wales
My existing tyres on my Specialized Roubaix are 700x26C. When I look online, they all seem to be 700x25C so would it be ok to fit a 25C ?
Road bike tyres
- Thread starter gavroche
- Start date
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Mo1959
Legendary Member
- Location
- Perthshire,Scotland
Yep, or even a 28 for a bit more comfort.
vickster
Legendary Member
Agreed if you have the clearance
Mo1959
Legendary Member
- Location
- Perthshire,Scotland
If it's the reasonably up to date Roubaix should be fine. That's what I have on mine and I think most of the new bikes come with at least 28's fitted now.
vickster
Legendary Member
I’m not sure if he has rim or discs, guess the former if it came with 26s?
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
Just see what clearance is like. Some makes come up fatter anyway. If you've got room to the brake bridge and chainstays you'll be OK to go to 28.
Ming the Merciless
There is no mercy
- Location
- Inside my skull
There so much variance in tyre width, especially with different rim widths that the 25mm tyres may come up 26mm on your rims anyway.
OP
OP
gavroche
Getting old but not past it
- Location
- North Wales
My bike is from 2017 and has disc brakes.
Chislenko
Veteran
Just a footnote and I appreciate it may have been the make / type of tyre as opposed to the width but I put some 28's on mine a couple of weeks back and yes they were a lot more comfortable but boy did I struggle to get any speed up with them.
Put the 25's back on yesterday, been out for a ride this morning and 2mph faster over 32 miles.
I also appreciate other factors may come into play.
Put the 25's back on yesterday, been out for a ride this morning and 2mph faster over 32 miles.
I also appreciate other factors may come into play.
vickster
Legendary Member
Go fatter tyres then
Ming the Merciless
There is no mercy
- Location
- Inside my skull
Most likely, unless one set were race tyres and one set basic tractor tyres you won’t see 2mph between best and worst. If broadly same tyre but different widths you will hardly see any difference in speed, if at all.
the_craig
Über Member
- Location
- Lanarkshire
Bike tyres sometimes aren't the size that is printed on the sidewall. I have a pair of 25mm conti gatorskins on my winter bike which measure 24mm whereas 25mm Continental GP4000 II measure 27mm on on the same rim. They are also around 8mm taller from the rim which meant that they rubbed the frame. It's the same on my No.1. I upgraded to 32mm GP5000 STRs and they measure 33mm. But they have around half the rolling resistance of the Gatorskins so it's free speed.
If you want to get geeky about tyre widths and tyre pressures, check out Marginal Gains podcast on your podcast place. They also have blog posts at https://silca.cc/blogs/silca where they explain the science behind tyre pressures and rolling resistance. One snippet was that having too much pressure in your tyres causes increased rolling resistance. To overcome this increased rolling resistance uses the same amount of energy as the energy required to climb an extra 80m over a 100km course.
If you want to get geeky about tyre widths and tyre pressures, check out Marginal Gains podcast on your podcast place. They also have blog posts at https://silca.cc/blogs/silca where they explain the science behind tyre pressures and rolling resistance. One snippet was that having too much pressure in your tyres causes increased rolling resistance. To overcome this increased rolling resistance uses the same amount of energy as the energy required to climb an extra 80m over a 100km course.
OP
OP
gavroche
Getting old but not past it
- Location
- North Wales
Looking at Schwalbe Lugano 700x 28 tyres to replace on my Specialized Roubaix. Are they any good as I have never used that make ?
vickster
Legendary Member
They’re not very good in terms of puncture protection, for a budget tyre, I’d go for Rubinos (having come off on a greasy road on almost new Zaffiro pros I wouldn’t have those again, they came on a new to me bike)
