25 wide is the minimum for Paris Roubaix. The idea is to avoid the tyre to get stuck between 2 cobblestones. You don't have full control of the bike on the cobbles sectors. You have to pilot the bike firmly but not too much, and let it take its course too... a tricky combination.
The other thing I should mention is to pay attention to your efforts. We said that following the peloton until the first sectors is a good option but only if you're in a very good condition. If you reach exhaustion too soon you'll regret it. The challenge with PR cobbles is to get through them as fast as possible. You can relax in between. The enemy is the level of vibration and the fastest you go, the less vibrations you get. When you climb a mountain, you can always try to reduce the pace, shift gears... On the cobbles the slower you go the worst you get. The first time I did it, it rained constantly so I was very aware of not crashing. Since your hands are on the top of the bars, braking or shifting gears can be tricky. So, every time I felt the bike sliding, I stopped pedaling to try and get through it. But everytime I did it, it was harder to get back on the original pace. At the first few sectors, I was attacking at 30/32 km/h and slowly decreasing pace down to 24/25km/h. For the last and longest sectors (Carrefour de l'arbre is 3km long I think and it is followed immediately by another 1.5km sector), I sometimes came down to 20 or even 15km/h at times. When you're stuck, you're stuck.
I loved it but I'm not sure I'll do it again. I want to, but I'm not sure I'll put my mind to it one more time.
The other thing I should mention is to pay attention to your efforts. We said that following the peloton until the first sectors is a good option but only if you're in a very good condition. If you reach exhaustion too soon you'll regret it. The challenge with PR cobbles is to get through them as fast as possible. You can relax in between. The enemy is the level of vibration and the fastest you go, the less vibrations you get. When you climb a mountain, you can always try to reduce the pace, shift gears... On the cobbles the slower you go the worst you get. The first time I did it, it rained constantly so I was very aware of not crashing. Since your hands are on the top of the bars, braking or shifting gears can be tricky. So, every time I felt the bike sliding, I stopped pedaling to try and get through it. But everytime I did it, it was harder to get back on the original pace. At the first few sectors, I was attacking at 30/32 km/h and slowly decreasing pace down to 24/25km/h. For the last and longest sectors (Carrefour de l'arbre is 3km long I think and it is followed immediately by another 1.5km sector), I sometimes came down to 20 or even 15km/h at times. When you're stuck, you're stuck.
I loved it but I'm not sure I'll do it again. I want to, but I'm not sure I'll put my mind to it one more time.