Backing onto Race Ramps
Due to space obstacle constraints I'll need to back onto my Race Ramps. Before I attempt this has anyone tried backing onto Race Ramps and used the roll-ups in the front? My car is fairly low in front (<26" from wheel well to ground) and I'm not sure if the spoiler is going to drag if I attempt this. The spoiler barely clears with a slight rub on the 87-2 ramps when using them in front.
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Originally Posted by CrystalRedTed
(Post 1599403396)
Due to space obstacle constraints I'll need to back onto my Race Ramps. Before I attempt this has anyone tried backing onto Race Ramps and used the roll-ups in the front? My car is fairly low in front (<26" from wheel well to ground) and I'm not sure if the spoiler is going to drag if I attempt this. The spoiler barely clears with a slight rub on the 87-2 ramps when using them in front.
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I use the 7-1/2' Raceramps for my enclosed trailer. All I can say is I would never attempt to back on to them.
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Originally Posted by CrystalRedTed
(Post 1599403396)
Due to space obstacle constraints I'll need to back onto my Race Ramps. Before I attempt this has anyone tried backing onto Race Ramps and used the roll-ups in the front? My car is fairly low in front (<26" from wheel well to ground) and I'm not sure if the spoiler is going to drag if I attempt this. The spoiler barely clears with a slight rub on the 87-2 ramps when using them in front.
LGC - ((OH/WB) x RH) = AGC Legend: LGC = Ground clearance below spoiler when car is on level ground OH = Overhang distance from front axle to spoiler edge that might scrape WB = Wheelbase RH = Ramp platform height AGC = Ground clearance below spoiler after rear tires are on ramp platform Assumptions for examples: LGC = 4" OH = 35" WB = 105" RH = 10" for RLL-87-2, 6" for Rhino Ramps RLL-87-2 example: 4" - ((35"/105") x 10") = 0.7" Rhino Ramp example: 4" - ((35"/105") x 6") = 2.0" YMMV if the pavement is not perfectly level. For example if your garage floor is pitched towards a drain the final ground clearance could be reduced if the front tires are rolling towards the drain. Tip for using Roll-ups: Position the Roll-ups so that the tires on the Roll-ups cannot overshoot the Roll-ups platform area. If the tires are allowed to descend the front incline section of the Roll-ups, the front and rear tires will be "wedged" between the stops on the primary ramp platform and the front incline on the Roll-ups. Use this formula to estimate the distance to leave between the trailing edge of the primary ramps and the leading edge of the Roll-ups. Wheelbase - Primary Ramp length - 2" = Distance between Primary Ramp and Roll-ups. RLL-87-2 example assuming 105" wheelbase: 105" - 87" - 2" = 16" RR-56-2 example assuming 105" wheelbase: 105" - 56" -2" = 47" |
Originally Posted by Fred@ReverseLogic
(Post 1599404004)
Here's a formula you can use to estimate the clearance below the spoiler with the rear tires on the ramp platforms.
LGC - ((OH/WB) x RH) = AGC Legend: LGC = Ground clearance below spoiler when car is on level ground OH = Overhang distance from front axle to spoiler edge that might scrape WB = Wheelbase RH = Ramp platform height AGC = Ground clearance below spoiler after rear tires are on ramp platform Assumptions for examples: LGC = 4" OH = 35" WB = 105" RH = 10" for RLL-87-2, 6" for Rhino Ramps RLL-87-2 example: 4" - ((35"/105") x 10") = 0.7" Rhino Ramp example: 4" - ((35"/105") x 6") = 2.0" YMMV if the pavement is not perfectly level. For example if your garage floor is pitched towards a drain the final ground clearance could be reduced if the front tires are rolling towards the drain. Tip for using Roll-ups: Position the Roll-ups so that the tires on the Roll-ups cannot overshoot the Roll-ups platform area. If the tires are allowed to descend the front incline section of the Roll-ups, the front and rear tires will be "wedged" between the stops on the primary ramp platform and the front incline on the Roll-ups. Use this formula to estimate the distance to leave between the trailing edge of the primary ramps and the leading edge of the Roll-ups. Wheelbase - Primary Ramp length - 2" = Distance between Primary Ramp and Roll-ups. RLL-87-2 example assuming 105" wheelbase: 105" - 87" - 2" = 16" RR-56-2 example assuming 105" wheelbase: 105" - 56" -2" = 47" |
Originally Posted by CrystalRedTed
(Post 1599404049)
Thanks. I assume this formula works both forward and backwards (backing onto the ramp)
Don't forget to use the actual measurements for your car and ramps. |
Originally Posted by Fred@ReverseLogic
(Post 1599404004)
Here's a formula you can use to estimate the clearance below the spoiler with the rear tires on the ramp platforms.
LGC - ((OH/WB) x RH) = AGC Legend: LGC = Ground clearance below spoiler when car is on level ground OH = Overhang distance from front axle to spoiler edge that might scrape WB = Wheelbase RH = Ramp platform height AGC = Ground clearance below spoiler after rear tires are on ramp platform Assumptions for examples: LGC = 4" OH = 35" WB = 105" RH = 10" for RLL-87-2, 6" for Rhino Ramps RLL-87-2 example: 4" - ((35"/105") x 10") = 0.7" Rhino Ramp example: 4" - ((35"/105") x 6") = 2.0" YMMV if the pavement is not perfectly level. For example if your garage floor is pitched towards a drain the final ground clearance could be reduced if the front tires are rolling towards the drain. Tip for using Roll-ups: Position the Roll-ups so that the tires on the Roll-ups cannot overshoot the Roll-ups platform area. If the tires are allowed to descend the front incline section of the Roll-ups, the front and rear tires will be "wedged" between the stops on the primary ramp platform and the front incline on the Roll-ups. Use this formula to estimate the distance to leave between the trailing edge of the primary ramps and the leading edge of the Roll-ups. Wheelbase - Primary Ramp length - 2" = Distance between Primary Ramp and Roll-ups. RLL-87-2 example assuming 105" wheelbase: 105" - 87" - 2" = 16" RR-56-2 example assuming 105" wheelbase: 105" - 56" -2" = 47"
Originally Posted by Fred@ReverseLogic
(Post 1599404144)
The Roll-ups formula works for both directions. The ground clearance formula could be used to calculate clearance below whatever is the lowest thing on the rear of the car (i.e. diffuser, exhaust tips).
Don't forget to use the actual measurements for your car and ramps. |
Originally Posted by CrystalRedTed
(Post 1599404190)
I see what you're saying. I'm actually looking for input on clearance between the ground and front of the car while backing onto the ramps. The 87-2 has a two stage incline and when it hits the steeper section I'm not sure what happens up front while backing up the ramps. However I may be climbing the roll-ups with the front wheels at that point and may be fine.
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I have backed up onto mine with no issue. I had a very minor scrape of the air dam. Mine is also low. I have done it to replace mufflers, add a tunnel plate etc.
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Originally Posted by mcandrew67
(Post 1599405359)
I have backed up onto mine with no issue. I had a very minor scrape of the air dam. Mine is also low. I have done it to replace mufflers, add a tunnel plate etc.
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Originally Posted by saplumr
(Post 1599405406)
I can kick one or both of mine out when loading in trailer, not completely but they can move. That's the reason I wouldn't attempt to ever back up on anything steep.
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Originally Posted by mcandrew67
(Post 1599405603)
I have the 67" with the extensions as well, never kicked out on me.
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