Support road.cc

Like this site? Help us to make it better.

forum
road.cc bike forum

Tyre sizes on different wheels

by nmanfield
Wed, May 18, 2016 15:31
2

If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.

Add new comment

2 comments

Avatar
fukawitribe | 8 years ago
1 like

nmanfield wrote:

Ready to be shot down in flames on this.  I'm a big lad at over 100kg but cycle daily.  I recently bough a rose pro SL 2000 that came with 25mm wheels.  All very nice, but my winterbike has 28s on it which i find really comfy with my poor back.  I have managed to shoehorn on 28s to the Rose and there is no issue on th rear wheel.  Unfortunately the front wheel is a bit tight and rubs slightly on the top of the forks (i think due to a slight accumulation of dirt.   What would be intersting to know from my side is, is it possible to refit the 25mm on the front whel and keep the 28 on the back.  Would this have a disasterous affect on handling or could i simply reduce the pressure from 100 psi on the front to 80 ish and resolve the problem that way - we are talking  very little rubbing here in the first place   Thanks in advance.

First off, i'd say for general road riding, reduce the pressure anyway - front and back - one of the benefits of larger volume tyres is afterall that you can run at lower pressure without (necessarily) adversely effecting your rolling resistance whilst gaining on the comfort side of things. 80psi on the front is more than enough for a 28mm on a typical road rim IMO, good place to start certainly and can go down as well as up from there. If there's no rub then i'd say give it a go for a bit and see how you like it and whether you can see any rubbing that wasn't there when static-ish. If there is any rubbing i'd personally be tempted to not use it, YMMV... If the 28mm is not working for you for whatever reason, there should be no problem with mixing the 25mm and 28mm from a handling POV, worth spending a bit of time getting the pressures how you like them though (will be slightly different to the normal balance/split).

Avatar
nmanfield replied to fukawitribe | 8 years ago
0 likes

fukawitribe wrote:

nmanfield wrote:

Ready to be shot down in flames on this.  I'm a big lad at over 100kg but cycle daily.  I recently bough a rose pro SL 2000 that came with 25mm wheels.  All very nice, but my winterbike has 28s on it which i find really comfy with my poor back.  I have managed to shoehorn on 28s to the Rose and there is no issue on th rear wheel.  Unfortunately the front wheel is a bit tight and rubs slightly on the top of the forks (i think due to a slight accumulation of dirt.   What would be intersting to know from my side is, is it possible to refit the 25mm on the front whel and keep the 28 on the back.  Would this have a disasterous affect on handling or could i simply reduce the pressure from 100 psi on the front to 80 ish and resolve the problem that way - we are talking  very little rubbing here in the first place   Thanks in advance.

First off, i'd say for general road riding, reduce the pressure anyway - front and back - one of the benefits of larger volume tyres is afterall that you can run at lower pressure without (necessarily) adversely effecting your rolling resistance whilst gaining on the comfort side of things. 80psi on the front is more than enough for a 28mm on a typical road rim IMO, good place to start certainly and can go down as well as up from there. If there's no rub then i'd say give it a go for a bit and see how you like it and whether you can see any rubbing that wasn't there when static-ish. If there is any rubbing i'd personally be tempted to not use it, YMMV... If the 28mm is not working for you for whatever reason, there should be no problem with mixing the 25mm and 28mm from a handling POV, worth spending a bit of time getting the pressures how you like them though (will be slightly different to the normal balance/split).

Sometimes the simplest of advice can provide the best of solutions.  I have always run my tyres at a high pressure anyway - having come from 23mm run front and rear at 120psi in the past, i was running the 28mm at 100 psi  - this is what has led to the rub on the front.

Dropped the front to 75 and rear to 90 psi and problem has been solved.  No requirement to go for the hot-rod style thin tyre at front and fat one at the back now!

In general are people running lower pressures at the front than at the back given most weight is over the rear wheel (and in my case there's plenty of it!) - what are the advantages / disadvantages of doing this?

 

Thanks again!

Latest Comments