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# After thousands of miles of use, the tread on many bike tires wears do

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Manager
Joined: 26 Dec 2018
Posts: 144
Location: India
After thousands of miles of use, the tread on many bike tires wears do  [#permalink]

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Updated on: 24 Jan 2019, 06:09
1
00:00

Difficulty:

35% (medium)

Question Stats:

72% (01:45) correct 28% (01:52) wrong based on 139 sessions

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After thousands of miles of use, the tread on many bike tires wears down. One common theory about why tires wear down contends that the perpetual friction and heat generated by the contact between the tire and pavement erode the material on the surface of the tire. However, a local scientist who is also an avid cyclist proposed a new theory for why bike tires wear down. This scientist contended that chemicals from the road's composition and chemicals from rain residue wore down the surface of the tire.

Which of the following would best evaluate the veracity of the scientist's proposed theory?

A) Ride a road bike aggressively through spring rain storms.

B) Place chemicals from rain water and pavement on a bike's idle tires.

C) Ascertain whether chemicals from the road's composition also reside within the bike's frame.

D) Ascertain whether the bike's frame is made of rust-resistant components.

E) Determine the number of miles that a bike tire can be used on a wet road before wearing down.

SOURCE: PlatinumGMAT

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Originally posted by UB001 on 14 Jan 2019, 22:42.
Last edited by UB001 on 24 Jan 2019, 06:09, edited 1 time in total.
Manager
Joined: 22 May 2017
Posts: 118
Re: After thousands of miles of use, the tread on many bike tires wears do  [#permalink]

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15 Jan 2019, 11:32
2
Tire wearing - due to friction
Scientist claim - only due to road chemical in rain residue

To evaluate scientist claim , we have to exclude friction in whatever test we are going to perform
Lets check options

A) Ride a road bike aggressively through spring rain storms.
Causes friction and road residue . Will not be able to evaluate OUT

B) Place chemicals from rain water and pavement on a bike's idle tires.
No friction . Only rain residue. Good way to evaluate. B it is

C) Ascertain whether chemicals from the road's composition also reside within the bike's frame.
option is not talking about rains role . OUT

D) Ascertain whether the bike's frame is made of rust-resistant components.
OUT OF SCOPE

E) Determine the number of miles that a bike tire can be used on a wet road before wearing down.
OUT OF SCOPE
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Re: After thousands of miles of use, the tread on many bike tires wears do  [#permalink]

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20 Jan 2019, 05:04
Although the option is correct why it is not saying whether just placing the chemicals are enough.
I mean it should write something like place chemical and check.
The wording of the answer is incorrect as just placing the chemicals is not enough.

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Manager
Joined: 26 Dec 2018
Posts: 144
Location: India
Re: After thousands of miles of use, the tread on many bike tires wears do  [#permalink]

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24 Jan 2019, 06:12
OFFICIAL EXPLANATION: PlatinumGMAT

There are two different proposed causes of tire decay on bikes: (1) "contact between the tire and pavement" (2) "chemicals from the road's composition and chemicals from rain residue"

In order to ascertain which theory is correct, we must separate the two proposed causes. This can be done by applying chemicals from rain water and pavement (theory 2) onto a bike's idle tires. It is important that the bike is idle as this rules out theory 1.

A. This method does not isolate the new and proposed theory for why bike tires wear down as the testing method exposes the tires to both potential causes (i.e.: (1) tire and pavement contact (2) chemicals from the road's composition and rain residue).

B. This method isolates the two competing sources of explanations for the tires' erosion. If the tires erode under this scenario, we know that it was not riding on the pavement that caused the erosion but rather it was the exposure to chemicals.

C. This method does not account for both the potential influence of chemicals from the road's composition and chemicals from rain residue on the surface of the bike tire. Simply because the manufacturer used or did not use chemicals from the road's composition within the bike's frame does not enable us to conclude that the same chemicals will or will not have a corrosive effect if applied to the bike's tires. In other words, testing effects on the bike's frame is entirely unrelated to testing effects on the bike's tires as these two components (i.e., frame and tire) are made of entirely different materials.

D. This method does not account for the potential influence of chemicals from the road's composition and chemicals from rain residue on the surface of the bike tire. Simply because the manufacturer used or did not use rust-resistant components for the bike's frame does not enable us to conclude what effect water may have on the bike's tires. In other words, testing effects on the bike's frame is entirely unrelated to testing effects on the bike's tires as these two components are made of entirely different materials.

E. Without any useful frame of reference (such as the number of miles a tire can be used on a dry road or the number of miles a tire can be used in a grass field without the chemicals of a typical road), it is impossible to make any logical conclusion about whether friction or chemicals are causing the decay of the tire.

samguru68, Hope this helps..!
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Re: After thousands of miles of use, the tread on many bike tires wears do   [#permalink] 24 Jan 2019, 06:12
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