1. Attachments are working again! Check out this thread for more details and to report any other bugs.

LRR tires and boat ramps?

Discussion in 'Gen 3 Prius Fuel Economy' started by Higgins909, Dec 25, 2022.

  1. Higgins909

    Higgins909 Member

    Joined:
    Apr 15, 2018
    268
    59
    2
    Location:
    Texas
    Vehicle:
    2010 Prius
    Model:
    III
    I'm just wondering about the potential future. Currently I have some oversized tires at 215/70R15, Yokohama Geolandar G015. They only have about 10k after 2-3 years. I need to visually inspect them, but I think they're like new. Grip and comfort is up but acceleration and mpg is down. This makes me want to go back to stock size and LRR tires. However I fear I will have lesser traction on the boat ramp.

    I don't know if LRR tires have a super great compound that it would be ok or if it's more about tread pattern. But would I then have problems going up the boat ramp? Does anyone know?

    Thanks,
    Higgins909
     
    #1 Higgins909, Dec 25, 2022
  2. CR94

    CR94 Senior Member

    Joined:
    Dec 2, 2014
    2,642
    1,140
    0
    Location:
    Northwestern S.C.
    Vehicle:
    2011 Prius
    Model:
    Two
    Are you taking into account the fact that the apparent loss of acceleration isn't entirely real, because the larger tires cause your odometer and speedometer to show less than actual distance and speed? On another hand, it's real to the extent it increases weight and aerodynamic drag.
    Any difference in traction is unpredictable, probably slightly more likely to be worse with LRR tires. That will depend on tread compound used by the relevant brands and models.
     
    #2 CR94, Jan 5, 2023
  3. Mendel Leisk

    Mendel Leisk EGR Fanatic

    Joined:
    Oct 17, 2010
    56,671
    39,222
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Theoretically that’s 1.35” lift and 7% reduction on revs per mile.
     
    #3 Mendel Leisk, Jan 6, 2023
  4. CR94

    CR94 Senior Member

    Joined:
    Dec 2, 2014
    2,642
    1,140
    0
    Location:
    Northwestern S.C.
    Vehicle:
    2011 Prius
    Model:
    Two
    I meant "Are you taking into account the fact that the apparent loss of mpg and acceleration isn't entirely real ...?"
     
    #4 CR94, Jan 6, 2023
  5. Higgins909

    Higgins909 Member

    Joined:
    Apr 15, 2018
    268
    59
    2
    Location:
    Texas
    Vehicle:
    2010 Prius
    Model:
    III
    So my speedo went from showing 50 at 49mph gps, to showing 50 at 53mph gps. Went from reading 1 high, to 3 low... I think that makes sense. This brought my fuelly calculations to match my trip average mpg, that I reset every fill up. Each tire weighs about 10lbs more then stock size. So extra 40lbs rolling mass. Losing 8mpg is a 30% loss if I've done my math correctly. I don't think that would equal the 7%~mph difference?

    There is a video somewhere on YT where they put bigger tires on a Subaru Forester I think it was. It made it's 0-60 2-3 seconds slower or something.
     
    #5 Higgins909, Jan 19, 2023
  6. tonynap

    tonynap Member

    Joined:
    Jan 13, 2019
    43
    37
    0
    Location:
    NY
    Vehicle:
    2012 Prius
    Model:
    Two
    I stopped installing the LRR tires because of wet traction issues I was having.
     
    #6 tonynap, Jan 20, 2023
    Higgins909 likes this.
  7. qdllc

    qdllc Senior Member

    Joined:
    Aug 25, 2013
    1,370
    399
    0
    Vehicle:
    2013 Prius
    Model:
    Two
    For me, the issue with boat ramps is the crap that accumulates on them (if not maintained). LRR tires should have no loss of traction on a maintained boat ramp, and “good” tires will struggle on a poorly maintained ramp.
     
    #7 qdllc, Feb 4, 2023
    Higgins909 and tonynap like this.
(You must log in or sign up to post here.)