Effect on head angl...
 

[Closed] Effect on head angle of smaller rear tyre.

 Earl
Posts: 1902
Free Member
Topic starter
 

Usually run 2.1 both F&R.

How much difference in head angle/handling would running a 2.3F and 2.1R make? Noticeable or negotiable? What would be the equivalent reduction in travel if I were to correct it with a u-turn fork?


 
Posted : 25/12/2010 11:59 pm
Posts: 41395
Free Member
 

you could turn your fork down by .2"

difference in head angle will be less than a quarter of a degree otherwise.


 
Posted : 26/12/2010 12:15 am
Posts: 0
Free Member
 

Going for a carp before getting on the bike would probably have more of an affect.


 
Posted : 26/12/2010 12:22 am
Posts: 3722
Free Member
 

Al knows. He's a maths boffin.


 
Posted : 26/12/2010 12:22 am
Posts: 0
Free Member
 

Assuming each tyre has got a 100% aspect ratio, that's 0.2" on the diameter, or 0.1" on the radius.
That's less than the tread depth.
Do you notice a change in the head angle as your tyres wear down ?


 
Posted : 26/12/2010 12:44 am
Posts: 41395
Free Member
 

radius, not diameter.

and given his tyres year equally how would that change the geometry?

ooh...bottom bracket height! ๐Ÿ˜€


 
Posted : 26/12/2010 9:26 am
Posts: 4434
Free Member
 

Aha, but what happens as his camel back drains?


 
Posted : 26/12/2010 10:00 am
Posts: 17771
Full Member
 

and given his tyres year equally

But rear tyres wear a lot quicker than fronts.

Cause we all secretly love a nice skid every now and again. ๐Ÿ˜†


 
Posted : 26/12/2010 10:07 am
Posts: 0
Free Member
 

and when he goes for a pi$$ ๐Ÿ™‚


 
Posted : 26/12/2010 10:11 am
Posts: 41395
Free Member
 

stu you have not accounted for the higher pressure in his rear tyre ๐Ÿ˜Ž


 
Posted : 26/12/2010 10:12 am
Posts: 17771
Full Member
 

๐Ÿ˜†


 
Posted : 26/12/2010 10:13 am
Posts: 0
Free Member
 

I said radius. ๐Ÿ˜•

Anyway, there seems to be more than 0.1" radial run out on the average mountain bike tyre from what I've seen.
That means the frame geometry must be changing with every revolution of the wheels.
In fact, the change would constantly vary during a ride depending on whether the high and low spots on the two wheels were synchronised or not.
It's a wonder anyone ever manages to ride a bike.


 
Posted : 26/12/2010 10:20 am