Home » 2018

1×13 groupset by Rotor – honest preview

Honest preview of Rotor 1x13 groupset

Updated: 02/09/2019. Reading a local (Serbian) Facebook group Bicikliramo, I came across a post showing a new 1×13 bicycle groupset. That got me interested. After some googling, looking into it, it turned out that a Spanish company called Rotor is “the culprit”, so I wrote them an e-mail, explaining who I am, and said that … Read more 1×13 groupset by Rotor – honest preview

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Pros and cons of 1x groupsets/systems

1x systems (groupsets) pros and cons

Updated: 21/06/2020. Cycling industry, mostly for marketing reasons, moves towards ever increasing “number of speeds“. However, there is also a trend of having fewer front chainrings (while ever increasing the number of rear ones). First the triples were extinct from high end groupsets of big manufacturers, then they came for the doubles. 🙂  Today’s modern … Read more Pros and cons of 1x groupsets/systems

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The best bicycle chain lubricant

The best "oil" (lubricant) for bicycle chains

Updated: 16/11/2018. Often asked question (and debate) among cyclists, whether beginners, or experienced: “What is the best bicycle chain lube?” Short answer: chainsaw bar oil, diluted with diesel (or odourless mineral spirits) half-half. For those prepared to re-apply lube more often, even during one long ride, wax based lubricants are also an option. Chan that … Read more The best bicycle chain lubricant

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“Stack and reach” – effective size of a bicycle frame

Stack and reach - effective bicycle frame size

Updated: 16/11/2018. Like it was explained in an earlier article about choosing a correct frame size, modern frame designs make it impossible to tell if a frame will fit a rider just by measuring the seat tube length. Quick and relatively simpler way for sizing, explained in the mentioned article, is measuring the effective top … Read more “Stack and reach” – effective size of a bicycle frame

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Shimano XTR M9100 – (honest) overview of a new 12 speed MTB groupset

Shimano XTR M9100 new Shimano MTB groupset - review, technical specifications etc.

Updated: 01/05/2020. In the summer of 2018, a new MTB groupset Shimano XTR M9100 saw the ligth of day. What are the first impressions? What do the technical specifications look like? What has changed? In this post I’ll give an overview of the new XTR M9100 groupset. Rear chainrings are often referred to by a … Read more Shimano XTR M9100 – (honest) overview of a new 12 speed MTB groupset

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Bicycle braking technique on long descends

Bicycle braking technique on long descends

Updated: 08/11/2018. One of the nicer parts of cycling, at least for the author of this text, is riding down hills – the longer and faster, the better, whether on paved roads, or through forests. 🙂  This post will explain good bicycle braking on long descends techniques, that allow for safe and fun cycling down … Read more Bicycle braking technique on long descends

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Approach to bicycle servicing

First steps (approach) when servicing a bicycle

Updated: 08/11/2018. This post is about approaching a bicycle that needs repairs, or regular maintenance. Perhaps it sounds a bit absurd – “what’s the big deal in how to approach a bicycle?”, but in the remainder of this post, I’ll explain what’s the “catch”. Contents: 0. Introduction 1. Talking to the client …1.1. Listening …1.2. … Read more Approach to bicycle servicing

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Right and left hand(ed) thread

left and right handed thread

Updated: 08/11/2018. Term “left handed thread” is often used in cycling literature and practise. This post explains the difference between (a more common) right handed and left handed thread. Before explaining the left handed thread, first the right handed one will be explained.   1. Right handed thread – “the rule of right thumb” Right … Read more Right and left hand(ed) thread

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Posting questions, or comments

Questions and comments for bikegremlin.com website, YouTube, Facebook, Twitter, Instagram and Google+ profiles

Updated: 11/06/2020. This post explains some basic “rules” for posting questions and/or comments on the website (same goes for the BikeGremlin Youtube, Instagram, Facebook, and Twitter channels). 1. How to post a question? First try a website search – you can find the answers for most of the questions in one of the articles here. … Read more Posting questions, or comments

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Are narrower tyres “faster” – rolling resistance

Are narrow tyres faster?

Updated: 28/03/2019. This post explains what rolling resistance is, what affects it and how it can be minimised. Contents:1. What is rolling resistance?2. What affects the rolling resistance?….2.1. Tyre’s mass (“weight”)….2.2. Tread pattern….2.3. Sidewall and rubber compound quality….2.4. Aerodynamic drag….2.5. Air pressure in the tyre….2.6. Tyre (wheel) diameter….2.7. Tyre width….2.8. Road conditions3. Conclusion? 1. What … Read more Are narrower tyres “faster” – rolling resistance

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Pros and cons of bicycle disc brakes (compared to rim brakes)

Advantages and disadvantages of bicycle disk brakes

Updated: 09/09/2019. This post provides a short overview of advantages and disadvantages of bicycle disc brakes, compared to rim brakes (whether they are cantilever, road, or V-brakes). When comparing, it is understood that the brakes are of a good build quality and set up properly. Update: if it helps anyone, I made a series of … Read more Pros and cons of bicycle disc brakes (compared to rim brakes)

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Bicycle handlebar dimension standards

Bicycle handlebar dimension standards

Updated: 16/11/2018. This post will give overview of bicycle handlebar size standards, in terms of stem mounting area as well as grip mounting area (or bar wrap area for road “drop” bars). Other important dimensions of road bike bars are explained in the post about road bar geometry, while important considerations for flat bars are given … Read more Bicycle handlebar dimension standards

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Bicycle stem size standards

Bicycle stem size standards (dimensions)

Updated: 16/11/2018. Table of contents: 0. Introduction 1. Types of stems ….1.1. Quill stem ….1.2. Threadless stem 2. Important dimensions and how to measure ….2.1. Handlebar (clamp) attachment diameter ….2.2. Steering column attachment diameter 3. Stem dimension standards ….3.1. Handlebar clamp dimension standards ….3.2. Steering column attachment dimension standards ……..3.2.1. Threaded stems ……..3.2.2. Threadless stems … Read more Bicycle stem size standards

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Bicycle cassette (rear chainrings) standards

Bicycle cassette standards - uniglide, hyperlide, 6, 7, 8, 9, 10, 11, 12 speeds, XD...

Updated: 30/03/2020. This post will explain bicycle rear chainrings standards. Since in cycling literature a term “sprocket” is used to refer to rear chainrings, that term will be used in the remainder of this post (and most other on this site). In cycling terminology, term “chainring” usually refers to front chainrings only. Contents:1. Introduction2. Sprocket … Read more Bicycle cassette (rear chainrings) standards

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Bicycle drive chain standard dimensions

Bicycle drive chain dimension standards - 6, 7, 8, 9, 10, 11, 12 speeds...

Updated: 05/06/2019. This post will give overview of bicycle driving chains standard dimensions. Each chain has three important dimensions: pitch, inner diameter and outer diameter. 1. Bicycle driving chain pitch Chain pitch is the distance at which the pins are placed. It is measured by measuring the distance between 3 links, then dividing it by … Read more Bicycle drive chain standard dimensions

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Headsets [03] Headset bearings standards – SHIS

Standard dimensions (sizes) of bicycle headsets (fork bearings) - SHIS

Updated: 25/11/2018. Previous two posts have explained the names of steerer parts and how to measure the important dimensions. This post deals with headset bearings standards. If (re)packing a (new) headset with loose bearing balls, see: Standard bicycle bearing ball sizes. Contents: 1. Introduction 2. Marking rules (format) 3. Standard dimensions …3.1. Head tube inner … Read more Headsets [03] Headset bearings standards – SHIS

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Theory vs practice

Theory, or practise - what is more important?

Updated: 08/11/2018. Theory is when everything is known, but nothing works. Practice is when everything works, but no one knows why. In Bike Gremlin garage, we combine theory and practice: nothing works and no one knows why!  🙂 This post gives my personal opinion on theory and practice in terms of (bicycle) mechanics and engineering. … Read more Theory vs practice

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Headsets [02] Important fork, head tube and headset dimensions

Important dimensions of head tube, steerer tube and headsed bearings

Updated: 05/07/2020. In a previous post headset construction was explained and important parts were noted. That post can be read here: Names of bicycle fork, head tube and headset parts (1st article in this series). Part names defined in that post will be used here. This post will explain what needs to be measured when changing, or … Read more Headsets [02] Important fork, head tube and headset dimensions