KDP categories · Top KDP authors
Tribology: Amazon KDP category data
Amazon Books Best Sellers data for Tribology, updated Nov 2, 2026: median price $86.05, median 3 reviews, average rating 4.3 and a KDPTop opportunity score of 24/100 (highly competitive).
| Price range (middle 50%) | $29.90 – $140 |
|---|---|
| Average rating | 4.3 |
| New releases (90 days) | 13% |
| Books on the list | 100 |
| Store | Books |
What stands out
- Its median reviews are 1% of the parent category Mechanical (303), one of the easier corners under it.
- At $86.05 its median price beats 99% of Books categories, leaving more margin per copy.
- Its review barrier is lower than in 94% of Books categories: the median best seller has only 3 reviews, so new books can chart with few.
Top 10 Tribology best sellers
-
Small Engine Repair Handbook for Beginners: Fix Your Own Mower, Chainsaw, Generator and Snowblower, Stop Replacing the Wrong Part, and Use the Right Numbers for Your 2-Stroke or 4-Stroke Engine
- List rank#1
- Price$22.99
- Rating4.6
- Reviews37
-
Practical Plant Failure Analysis: A Guide to Understanding Machinery Deterioration and Improving Equipment Reliability, Second Edition
by Neville W Sachs P.E.
- List rank#2
- Price$42.51
- Rating4.7
- Reviews17
-
THE Only Small Engine Repair HANDBOOK For All Beginners: An Illustrated Guide to Diagnose No-Starts, Clean Carburetors, Avoid Costly Guesswork, and ... & Generator (AUTOMOTIVE AND WIRING WORKSHOP)
- List rank#3
- Price$22.99
- Rating4.0
- Reviews1
-
Engineering Tribology
by Gwidon Stachowiak
- List rank#4
- Price$92.82
- Reviews-
-
The Vintage Fountain Pen Repair Manual: Complete Repair Procedures for Every Filling Mechanism, Body Material, and Major Manufacturer from the Golden Age of Fountain Pen Production
by Arthur Caldwell
- List rank#5
- Price$22.88
- Reviews-
-
The Vintage Typewriter Repair Bible: A Complete Technical Guide to Diagnosing, Restoring and Repairing Classic Typewriters
by Arthur Caldwell
- List rank#6
- Price$18.69
- Rating2.4
- Reviews5
-
FE Mechanical Exam Prep: The All-In-One Study Guide with 1500+ Practice Problems, Detailed Solutions, In-Depth Reviews, and 4 Practice Exams to Pass on Your First Try and Achieve EIT Status
by Learnova
- List rank#7
- Price$40.28
- Rating4.2
- Reviews273
-
Introduction to Tribology for Engineers
by Ashlie Martini
- List rank#8
- Price$19.99
- Rating4.4
- Reviews10
-
Industrial Mechanical Maintenance Handbook: Shaft Alignment, Bearings, Couplings, Belt and Chain Drives, Gearboxes, Lubrication and Precision Installation, with Worked Calculations for Millwrights
- List rank#9
- Price$89.99
- Rating4.8
- Reviews5
-
How to Repair, Restore, and Care for Antique Clocks: A Practical Guide to Maintaining, Repairing, Preserving, and Collecting Antique Timepieces
by Dawson Mercer
- List rank#10
- Price$18.99
- Reviews-
FAQ
Is Tribology a good niche for Amazon KDP?
Its KDPTop opportunity score is 24/100, which makes it highly competitive. The median best seller has 3 reviews and sells for $86.05.
How many reviews do you need to rank in Tribology?
The median best seller has 3 reviews, and 95% of them have fewer than 100.
What do Tribology best sellers cost?
The median price is $86.05; half of the best sellers are priced between $29.90 and $140.
Can new books break into Tribology?
13% of the current best sellers were released in the last 90 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.