Fitting 225/45/16 tyres to the rear - pros/cons
Discussion
FlipFlopGriff said:
Got an option on some but not sure what effect they will have. Not sure what diff I have but 70mph = 3,000 revs (on 225/50/16) so this will make it worse surely? This is whats curreently giving me some doubt.
Need to decide within next 24 hours.
FFG
225/50/16 ``the factory size for the rears ,diameter 632mmNeed to decide within next 24 hours.
FFG
225/45/16 diameter 608mm
Difference - 3.68%
speedo reads 70mph you will be doing 67.35mph
Your brakes will be less effective bacause of the smaller diameter ..less leverage.
SILICONEKID340HP said:
Your brakes will be less effective bacause of the smaller diameter ..less leverage.
Not quite... you are correct with less leverage.. but less leverage working against the same size brake disc... so they will actualy work better...Also quicker through the box etc so faster at pulling away.. but less top end....
TVR Beaver said:
SILICONEKID340HP said:
Your brakes will be less effective bacause of the smaller diameter ..less leverage.
Not quite... you are correct with less leverage.. but less leverage working against the same size brake disc... so they will actualy work better...Also quicker through the box etc so faster at pulling away.. but less top end....
SILICONEKID340HP said:
Smaller the wheel harder the brakes have to work ..
??.... Think of the set up... you have a leaver (your wheel in contact with the ground)and a known resistance (your brakes and disc).... What you are doing is trying to overcome the breaking force (this has not changed so it will be a constant)...However, changing the size of the leaver (wheel) will introduce a variable....
The longer the lever (bigger the wheel) the more chance you have of overcoming the resiatance (brakes)..
So the bigger the wheel dia.. the easier it is to overcome the brakes resistance...
mcosh said:
96k miles with toyos as the standard at 225 45 r16.....No problem... Smaller tyre wall less roll. Speedo slightly out but the other way... 40 mph is 36 on sat nav so who knows?
Standard is 225/50/16 not 45. Not heard of any 45 profile standard.The gearing on the BV is mad anyway with 70mph at 3,000 reves so this would have made it worse. not much left after 125 but suspect as it was a press car this was doen to improve acceleration at the expense of the top end to improve the reports.
FFG
TVR Beaver said:
SILICONEKID340HP said:
Smaller the wheel harder the brakes have to work ..
??.... Think of the set up... you have a leaver (your wheel in contact with the ground)and a known resistance (your brakes and disc).... What you are doing is trying to overcome the breaking force (this has not changed so it will be a constant)...However, changing the size of the leaver (wheel) will introduce a variable....
The longer the lever (bigger the wheel) the more chance you have of overcoming the resiatance (brakes)..
So the bigger the wheel dia.. the easier it is to overcome the brakes resistance...
'Thats exactly what i said but in simple terms larger wheel less strain on the brakes'.
TVR Beaver didn't say this and he is correct. He said the larger wheel would OVERCOME the brakes resistance. Maximum braking effect would be, if it were possible, for the disc and tyre to be the same size, whatever that diameter was.
FlipFlopGriff said:
Standard is 225/50/16 not 45. Not heard of any 45 profile standard.
The gearing on the BV is mad anyway with 70mph at 3,000 reves so this would have made it worse. not much left after 125 but suspect as it was a press car this was doen to improve acceleration at the expense of the top end to improve the reports.
FFG
Been on them yearsThe gearing on the BV is mad anyway with 70mph at 3,000 reves so this would have made it worse. not much left after 125 but suspect as it was a press car this was doen to improve acceleration at the expense of the top end to improve the reports.
FFG
http://www.blackcircles.com/tyres/brands/toyo/prox...
According to Steve Heaths bible: (OEM at the time)
early griffs (4.0/4.3) 225/50/16 rear
early 500's 225/50/16 (1993/94) rear
94/95 griff 500's 235/50/16 rear
the date in book as now (96/97?) then had 500's as 245/45/16 rear
245/45/16 was standard on mine (OEM) 1998 griff
early griffs (4.0/4.3) 225/50/16 rear
early 500's 225/50/16 (1993/94) rear
94/95 griff 500's 235/50/16 rear
the date in book as now (96/97?) then had 500's as 245/45/16 rear
245/45/16 was standard on mine (OEM) 1998 griff
Edited by BJWoods on Thursday 4th October 16:59
Edited by BJWoods on Thursday 4th October 17:00
FlipFlopGriff said:
Standard is 225/50/16 not 45. Not heard of any 45 profile standard.
The gearing on the BV is mad anyway with 70mph at 3,000 reves so this would have made it worse. not much left after 125 but suspect as it was a press car this was doen to improve acceleration at the expense of the top end to improve the reports.
FFG
Looking at replacing my hardly worn but very old tyres at the moment and saw this. Glad it's not just my factory BV that seems to have such short gearing! My box/diff is the same as yours by your 70mph reference. Definitely much shorter geared than my old 500 (notwithstanding the T5/Rover differences).The gearing on the BV is mad anyway with 70mph at 3,000 reves so this would have made it worse. not much left after 125 but suspect as it was a press car this was doen to improve acceleration at the expense of the top end to improve the reports.
FFG
Do you happen to know exactly what your diff and ratio's are? I wonder whether there were any differences or changes in the pre-cat production?
JamesK said:
Looking at replacing my hardly worn but very old tyres at the moment and saw this. Glad it's not just my factory BV that seems to have such short gearing! My box/diff is the same as yours by your 70mph reference. Definitely much shorter geared than my old 500 (notwithstanding the T5/Rover differences).
Do you happen to know exactly what your diff and ratio's are? I wonder whether there were any differences or changes in the pre-cat production?
I don't but I'm sure someone would know. Mine is the factory/press car so I can see why the factory would increase accerlation at the expense of top end. There is no visible tag on the diff to state the ratio.Do you happen to know exactly what your diff and ratio's are? I wonder whether there were any differences or changes in the pre-cat production?
FFG
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