I found an answer from www.quora.com

Is it possible to construct a **wheel** in a **shape** other than a **circle** ...

Jul 4, 2016 **...** But, only this is **not** enough for its utility in practical applications,the **shape** ... A
**Reuleaux triangle** (along with all other curves of **constant width**) can roll ... “is it
possible for a **vehicle** to have **wheels** if other **shape** than a **circle**?”.

For more information, see Is it possible to construct a **wheel** in a **shape** other than a **circle** ...

I found an answer from en.wikipedia.org

Wankel engine - Wikipedia

The Mazda RX-8, a sports **car** powered by a Wankel engine and the last
production **car** using a Wankel engine. Norton Classic air-cooled twin-rotor
motorcycle. The Wankel engine is a type of internal combustion engine using an
eccentric rotary design to ... The rotor is similar in **shape** to a **Reuleaux triangle**
with the sides somewhat ...

For more information, see Wankel engine - Wikipedia

I found an answer from au.answers.yahoo.com

Why are manhole covers round? | Yahoo Answers

(A **Reuleaux triangle** or other **curve of constant width** would also serve ... Circular
covers do **not** need to be rotated to align them when covering a circular manhole.
... The width of a square would be greater than the diameter of a **circle** for .... What
industries does Tesla operate other than the **auto** industry?

For more information, see Why are manhole covers round? | Yahoo Answers

I found an answer from en.wikipedia.org

**Reuleaux triangle** - Wikipedia

A **Reuleaux triangle** [ʁœlo] is a shape formed from the intersection of three
circular disks, each having its center on the boundary of the other two. Its
boundary is a **curve of constant width**, the simplest and best known such .... More
generally, for every **curve of constant width**, the largest inscribed **circle** and the
smallest ...

For more information, see **Reuleaux triangle** - Wikipedia

I found an answer from demonstrations.wolfram.com

Bicycle **Wheels** Using Curves of **Constant Width** - Wolfram ...

Jan 6, 2014 **...** When rolled as **wheels** of a bicycle curves of **constant width** provide a uniform ...
three and infinity, and include **Reuleaux triangles** and **circles**.

For more information, see Bicycle **Wheels** Using Curves of **Constant Width** - Wolfram ...

I found an answer from www.reddit.com

Perfectly stable bike with **triangular wheels** : blackmagicfuckery

Jul 7, 2017 **...** Thinking of getting a rx7 or rx8 as a second **car** with my speed3. .... Actually
Mazda rotary **wheels** are **not** true roleaux **triangles**, they're slightly different ....
**Instead**, the weight of the bike is resting on the top of the **wheel**, which would
keep ..... They aren't actually **triangles**, they are **shapes of constant width**.

For more information, see Perfectly stable bike with **triangular wheels** : blackmagicfuckery

I found an answer from www.reddit.com

There are curves of **constant width** besides **circles** and spheres ...

Aug 12, 2014 **...** /r/ALLThere are curves of **constant width** besides **circles** and spheres (i.imgur.
com) ...... **circles**, and using the **shape** in the middle as a **wheel**, but in 3
**dimensions instead**. .... at all; the **Reuleaux triangle** has **constant width**, but **not**
**constant** radius. ..... When are we going to see **cars** with **triangle wheels** then?

For more information, see There are curves of **constant width** besides **circles** and spheres ...

I found an answer from www.quora.com

Why aren't manhole covers **triangular**? - Quora

So, any **curve of constant width**, can rotate between pair of parallel lines without
changing their distance, and yeah they can work as **wheels** same as a disk, with
little bit ... but **Reuleaux triangle** would have the smallest area and the **circle**,
which is ... Then again, **triangular** manhole covers are, albeit **not** prevalent,
popular in ...

For more information, see Why aren't manhole covers **triangular**? - Quora

I found an answer from math.stackexchange.com

geometry - **Reuleaux** Rollers - Mathematics Stack Exchange

J. M. is **not** a mathematician Nov 3 '10 at 14:31 ... To easily see why the solution
below is insufficient, note that the **curve** below ... I'll provide a solution for the
**triangle**. ... we see that a road amenable to **Reuleaux wheels** consists of a series
of bumps. ..... As Z should keep its second coordinate **constant** we get the
condition.

For more information, see geometry - **Reuleaux** Rollers - Mathematics Stack Exchange