Mudguard size

Mudguard size

I’m buying SKS Chromoplastic Road Mudguards but am unsure of the correct size. I think I need size 700x28-37. The specification given on the tyre walls is: 32-622 and 28x11/4x13/4.

Steve Cowan

Yup, that’s the size. The bike trade, unfortunately, keeps its customers confused by describing tyres in a great many different ways, so I made a page to explain it: search for ‘tyre sizes’ at cyclinguk.org.

Mudguards are often sold without any tyre size guidance, just the width of the guard. In that case, you generally want a guard about 10mm wider than the tyre section. Too wide and the guard adds unnecessary wind resistance, too narrow and it’s hard to keep it from rubbing one side or other of the tyre, especially on rough roads where the guard tends to flap about. So a 35mm guard is good for tyres up to 25mm, or 28mm at a pinch – literally! The product you’re looking at is most likely a 45mm guard.

If a mudguard is too close to a tyre (especially one with a prominent tread) it can catch onto it, get carried around by the wheel, and jam into the frame. So it’s important to have enough clearance. And stay-release fittings are required for safety on a front guard, to let it break free if and when that starts to happen, because a front wheel jam invariably sends the rider over the handlebars!

Chris Juden

 

This was first published in the February / March 2014 edition of Cycling UK's Cycle magazine.

Sponsored Advert
Sponsored Advert
Sponsored Advert
Sponsored Advert
Sponsored Advert
Sponsored Advert
Support your employees to be heathier and happier through cycling
Start your application to become a Cycle Friendly Employer
Cycling UK continues to support the UK to cycle
This remains true during this difficult period with the ongoing threat of coronavirus Covid-19
Join Cycling UK to help us change lives and communities through cycling
Join Cycling UK to help us change lives and communities through cycling
Membership gives you peace of mind insurance, discounts in cycle shops, rides & routes