Rims for 100's cruiser - IFS

OK....
The car is an auto V8. first put a 2" lift (4wd megastores drop diff kit), I also currently still have the basket on the roof from the last trip, which has an awning attached to it. I've got drawers in the back (45kgs), an 80L waeco (34kgs), and the tyres currently run are 285/75R16.

The diameter of the cooper is 841mm as opposed to the 791mm factory fitted grandtreks (which only lasted about 30K), so by my calculations there is a 6% increase in travel ( might be doing the calcs incorrectly)

My old fuel economy was 650 kms per 110-115 ltrs (17L/100), (oh yeah, i have the petrol motor) whereas now i am getting about 550 kms from the same amount of fuel (20L/100).

The difference in circumference of tyres is 157mm which equates to 86m over the 550kms which is bugger all.

I may be doing the calcs wrong ???? i dunno.

By my calcs, i am spending a further $900 per year in fuel. If can get a set of rims for say $250+tyres @ $145-160 ea, I'm still ahead, and not wearing down the $1600 coopers around town.

That was my thought ????

Taps,

As you say the difference in tyre size is reflected in the larger diameter, you say about 6% and that sounds about right. In you fuel calcs you need to allow for this, hence the 550 k's on the odo are really 550 + 6%= 583k's travelled or say 18.86lt per 100 k. Now as others have mentioned were you getting thoses figures with all the accessories as 17% seems very good and anyhow you are really only using 1.86% extra based on the figures you have given. Keep in mind that the taller tyres take some extra effort as the taller the vehicle the less fuel efficient due to many factors ie aerodynamics. What Coopers are you running at $1600 again very exe and I would guess that was for all five. I would look at running two sets if your car is your daily drive and the off road set is a dedicated tyre not an a/t.
Cheers Walter

Walter,

I am running the 285/75R16 ST-T's. Probaby more aggresive than I'll ever need for the near future, but they didn't have the ST-C's in stock and I didn't like the "look" of the basic ST's (all terrain).
Where i am going in september is shale and I was advised that the ST won't handle the shale too well....but that's another story.

I have driven to QLD with the loaded basket on top, and heaps in the back, which would weigh more than what I am carrying now, and my fuel economy was the same as previously mentioned, ie around 17L/100.

The tank i am running around on now, is almost all gone and my odo reads 510kms. I 'estimate', that I've used about 110lts. This included some highway driving yesterday (central coast). allowing for the 6% increase thats about 540kms or 20.37L/100.

it's still the same.

Picked some up from a large tyre mob on Canterbury road in Sydney. $50 a pop from memory, was some years ago. Toyota were quoting $80.

Ingtar,

I am looking at about 3-4L/100. Doesn't sound like much, but it adds up quickly, not only in money but in time filling that tanks every weeks opposed to every 10-14 days.

At $1.25 per litre (a conservative figure), it costs an extra $900 ish per year. That's almost a good winch.

The details would be good.....ok, now how do I MM you ???
never done that before, and i'm only a guest member.

The details would be good.....ok, now how do I MM you ???
never done that before, and i'm only a guest member.

Sorry Mate,

Didn't look closely at your account status, fire me an email to IFS_Rims@hotmail.com and I'll send you the phone number.

Geoff