Imperial to metric tyre sizes?

dirtman650 · Totara Joined: 18 Nov 2009 Posts: 3

Anyone know what the equivalent metric sizes are

Front: 3.00-21 51P
Rear: 4.50-18 70P

DUCKRACER · Totara Joined: 25 Jun 2006 Posts: 641 Location: 45 south.

21s are usally a 90/90 or 100/90 and the rear 120/90 or 130/90. Guesstimate.

XR or DR or?

dirtman650 · Totara Joined: 18 Nov 2009 Posts: 3

Shod with

90/90-21
140/80-18

at mo . stickler for originality and want tyre size bike designerd round . XR650 Boss

DUCKRACER · Totara Joined: 25 Jun 2006 Posts: 641 Location: 45 south.

Sounds about right, although, 140 is fairly meaty. Depends on what you will be doing with it. Soley off road, On/Off road, or strictly road going.
Got to remember that most tyre manufacturers make tyres to thier own specs and hardly any two brands are identical in actuall size.

Good bikes. Great engine the 650. Very reliable and long lasting.

Oh, and welcome to NZMB.

dirtman650 · Totara Joined: 18 Nov 2009 Posts: 3

Thanks' wanting to do a mixture of on road off road
these meant to be awesome http://www.lmsimports.co.nz/products.php?cat=2&id=8
ben looking on trademe at new tires of all makes but not to sure on size' found this http://www.steelthundercc.com/tiresizes.html but stil confused
4.1 x 18 on trademe but could be to narrow for the bike' cheap as 25$

mite just buy a set of new eo7 mitas for 270$ ' bloke i know
knows a bloke with a bike rental biz and thats what thy use' 8000km getting.
You not wrong about the 650 being a great bike' feels light like a 250
went round bays other day and knobs held out ok just the braking iffie

This
front is 80/100-21 and rear is 110/100-18 metric
alpha 100/80-21 and 130/80-18

Is what aguy told me is the correct size' 130/80-18 cld be better for winding tar