70 profile tyres - SV650.org

23-12-06, 09:51 PM

i just had some new tyres on my curvy. the old front tyre had a profile of 60 and the new one has a profile of 70. will this effect my speedo. thanks

admin · 23-12-06, 10:30 PM

I think it will. The higher profile means that the wheel is slight larger in diameter and therefore larger in circumference. So the bike might travel farther for every revolution of the front wheel. And as the front wheel drives the speedo....

I doubt in reality it'll make a lot of difference, so don't worry.

John

21QUEST · 23-12-06, 10:38 PM

You speedo becomes more accurate.

Cheers
Ben

24-12-06, 04:39 PM

im sure it has affected it slightly. my sv, in 4th gear, does the same speed as rpm e.g. 4000 rmp for 40 mph. it used to do 105mph at the redline in 4th now it does a toutch over 100.

northwind · 24-12-06, 06:09 PM

Ben's right, makes your speedo closer to accurate, and therefore also your odometer.

25-12-06, 12:54 AM

I have calculated it:

at this moment I have a 70 and it says 122,5 km/h on the speedo when the GPS says 120 => 2%

***calculations***

a 60 tire gives 4% more
125 on the speedo is in reality 120 km/h

next time I will go for a 65, a compromise between stability (70) and flexibility (60).

25-12-06, 10:11 AM

Quote:

Originally Posted by northwind

Ben's right, makes your speedo closer to accurate, and therefore also your odometer.

i thought that it makes the speedo more accurate but odometers were meant to be accurate in the first place?

23-12-06, 09:51 PM	#1
01 sv650s Guest Posts: n/a	70 profile tyres i just had some new tyres on my curvy. the old front tyre had a profile of 60 and the new one has a profile of 70. will this effect my speedo. thanks

23-12-06, 10:30 PM	#2
admin John T Mega Poster Join Date: May 2003 Location: Shrewsbury, Shrops, UK Posts: 2,466	I think it will. The higher profile means that the wheel is slight larger in diameter and therefore larger in circumference. So the bike might travel farther for every revolution of the front wheel. And as the front wheel drives the speedo.... I doubt in reality it'll make a lot of difference, so don't worry. John __________________ Admin for this forum and the main site. John@sv650.org

24-12-06, 06:09 PM	#5
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,082	Ben's right, makes your speedo closer to accurate, and therefore also your odometer. __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Running 120/70 profile front tyres	Tim in Belgium	Tyres	7	14-02-08 04:49 PM
Taller Profile Tyres....120/70	bobit69	SV Talk, Tuning & Tweaking	33	20-08-06 10:04 PM
Non-standard profile tyres?	Bloo	Tyres	7	20-07-06 11:36 AM

24-12-06, 04:39 PM	#4
01 sv650s Guest Posts: n/a	im sure it has affected it slightly. my sv, in 4th gear, does the same speed as rpm e.g. 4000 rmp for 40 mph. it used to do 105mph at the redline in 4th now it does a toutch over 100.

25-12-06, 12:54 AM	#6
r4ce_e3nd Guest Posts: n/a	I have calculated it: at this moment I have a 70 and it says 122,5 km/h on the speedo when the GPS says 120 => 2% *calculations* a 60 tire gives 4% more 125 on the speedo is in reality 120 km/h next time I will go for a 65, a compromise between stability (70) and flexibility (60).