Editing Inline skates (section)

=== Trinity frames ===

{{multiple image
 | direction = vertical
 | width = 200
 | image1 = Powerslide Reign Ares hybrid skates-on Ego SL frame and Trident 100mm wheels-side-view-IMG 4721-bg-FRD.png
 | image2 = Powerslide Reign Ares hybrid skates-Trinity mount-215mm Ego SL frame-IMG 4812-bg-FRD.png
 | caption2 = A Trinity boot & frame
}}

The 165mm mounting standard, originally from speed skating, has dominated the inline skate market since the mid-1990s, except in aggressive skates that use UFS mounting and hockey skates that rely on rivets. However, not all inline boots are made from the stiff carbon-composite materials typical of speed boots. The small 165mm mounting area can lead to frame wobbles on boots lacking a rigid sole or reinforced mounting platforms.<ref name="vegter-everything-about-frames"/><ref name="zecoprzepraszam-inerview-powerside-on-trinity-165mm-195mm"/>

As larger wheels gained popularity in the 21st century, 165mm frames evolved to accommodate setups with bigger and sometimes fewer wheels. Some manufacturers increased frame height, which negatively affected stability and performance.<ref name="le-roller-en-ligne-on-165mm-195mm-triskates"/><ref name="zecoprzepraszam-inerview-powerside-on-trinity-165mm-195mm"/> Others relocated or downsized middle wheels to avoid interference with mounting bolts.<ref name="cadomotus-on-165mm-195mm-boots-on-ice-blades"/><ref name="rockin-frames-on-MIX4-and-165mm-mid-wheel-reductions">{{cite web
|url=https://rockinframes.com/lets-talk-facts-rockin-mix4-100-90/
|title=Let's talk facts: ROCKIN' MIX4 100/90
|date=2022-02-10
|website=ROCKIN’ Frames
|url-status=live
|archive-url=https://web.archive.org/web/20250302165315/https://rockinframes.com/lets-talk-facts-rockin-mix4-100-90/
|archive-date=2025-03-02
|access-date=2025-03-02
}}</ref> Some brands even shifted the mounting platforms forward or backward to fit specific wheel setups, causing front-to-back centering issues when mixing and matching boots and frames.<ref name="zecoprzepraszam-inerview-powerside-on-trinity-165mm-195mm"/><ref name="bladeville-inline-skate-frames"/> For instance, Rollerblade Twister and certain Seba boots have unconventional 165mm mount placements, making it difficult or even impossible to achieve proper longitudinal centering with aftermarket frames. To meet demand for these popular boots, Endless Blading released a version of its Endless 100 frame specifically-tweaked to fit them.<ref>{{cite web
|url=https://www.endlessblading.com/products/endless-100-rb-frame
|title=Endless 100 RB Frame
|others=A 165mm frame designed specifically for the Rollerblade RB/Twister series, Adapt Hyperskates, Seba, and other 165mm boots that can't properly center 3rd-party frames.
|website=Endless Blading
|url-status=live
|archive-url=https://web.archive.org/web/20250302172827/https://www.endlessblading.com/products/endless-100-rb-frame
|archive-date=2025-03-02
|access-date=2025-03-02
}}</ref>

The 195mm standard, introduced in 2003, better supported larger wheel setups without increasing frame height, relocating middle wheels, downsizing middle wheels, or shifting mounts.<ref name="powerslide-different-mounting-systems"/><ref name="cadomotus-on-165mm-195mm-boots-on-ice-blades"/> However, it also spread the mounting points farther apart – beyond the optimal heel-to-ball length that best supports an average foot. The 195mm standard required exceptionally stiff soles and boots, which were unavailable outside the speed skating market until the late 2010s. As a result, only speed boots made of carbon fiber adopted the 195mm standard.<ref name="cadomotus-on-165mm-195mm-boots-on-ice-blades"/><ref name="brannock-heel-to-ball-support-for-foot">{{cite web
|url=https://brannock.com/pages/instructions-fitting-tips
|title=Why Heel-to-Ball Is Essential
|website=The Brannock Device Company
|url-status=live
|archive-url=https://web.archive.org/web/20250129180026/https://brannock.com/pages/instructions-fitting-tips
|archive-date=2025-01-29
|access-date=2025-03-02
}}</ref><ref>{{Cite patent
|country=WO
|status=application
|number=2010051657
|fdate=2008-11-10
|pubdate=2010-05-14
|title=Bottom structure for inline roller skate shoes
|inventor1-first=Kai Nin
|inventor1-last=So
}}</ref>

{{multiple image
 | direction = vertical
 | width = 300
 | image1 = Trinity mounting-specs and dimensions and measurements-View Perspective-IMG 6202-annotated-FRD.jpg
 | image2 = Trinity mounting-specs and dimensions and measurements-View Ortho Top-IMG 6231-annotated-FRD.jpg
 | image3 = Trinity mounting-specs and dimensions and measurements-View Ortho Side-IMG 6241-annotated-FRD.jpg
 | caption3 = Trinity specifications 
}}

{{multiple image
 | direction = horizontal
 | total_width = 340
 | image1 = Trinity mounting-Boot showing three mounting platforms-IMG 3878-bg-FRD.png
 | image2 = Trinity mounting-Two front mounts-IMG 3871-bg-FRD.png
 | footer = Powerslide Tau boot with Trinity mounts
}}

In 2016, Powerslide introduced the '''Trinity''' mounting system to accommodate a wide range of modern wheel setups while addressing the shortcomings of both the 165mm and 195mm standards. Demonstrating its versatility, Powerslide launched Trinity-mounted boots and frames across multiple disciplines, including recreational, urban, speed, slalom, hockey, and off-road skating.<ref name="powerslide-launching-trinity-boots-and-frames-2016">{{cite web
|first1=Matthias
|last1=Knoll
|first2=Jürgen
|last2=Pfitzner
|first3=Scott
|last3=Arlidge
|title=Trinity Mount - The next level
|others=Powerslide introduced Trinity for all skating disciplines
|url=https://www.youtube.com/watch?v=GDC_ITPAb44
|website=youtube.com
|publisher=Powerslide
|language=en
|format=video
|date=2016-07-27
}}</ref><ref name="bladeville-glossary-terms-rollerblading"/>

The name "Trinity" reflects its three mounting points, in contrast to the two-point systems used in 165mm, 195mm, and UFS. Trinity features '''two front mounting points''' positioned on the sides with a longitudinal offset, avoiding the centerline where the two frontmost wheels are located. The vacated centerline allows front wheels of any size or configuration to be placed within millimeters of the boot sole. The '''rear mount''' is elevated by 10mm, creating a heel lift similar to the 165mm standard. Positioned under the heel and in line with the rear wheels, the rear mounting bolt remains unobtrusive due to the 10mm rise. The longitudinal offset positions the two front mounts asymmetrically under the medial and lateral sides of the ball of the foot. The three mounting points create a triangular configuration with sides measuring 150mm, 135mm, and 55mm. This design provides structural support tailored to a typical foot, ensuring optimal heel-to-ball alignment.<ref name="powerslide-matthias-knoll-Trinity-patent-2017">{{Cite patent
|country=US
|number=10524533
|pridate=2015-01-28
|fdate=2017-07-21
|pubdate=2020-01-07
|gdate=2020-01-07
|title=Roller skate system having a rail and a boot
|inventor1-first=Matthias
|inventor1-last=Knoll
|assign1=Powerslide GmbH
}}</ref><ref name="xinhaidude-ps-trinity-reign-as-big-wheel-urban-skate"/><ref name="brannock-heel-to-ball-support-for-foot"/><ref name="cadomotus-on-165mm-195mm-boots-on-ice-blades"/><ref name="powerslide-download-guides-frames"/>

{{multiple image
 | direction = horizontal
 | image1 = Powerslide Tau urban skate with hybrid carbon fiber shell-original frame w 90mm wheels-IMG 3786-right rotated-bg-FRD.png
 | image2 = Inline Skate-Hybrid boot with carbon shell-Powerslide Tau on Endless 90 frame with 3x110mm wheels-IMG 4271-FRD.png
 | caption1 = PS Tau boot on factory frame & 90mm wheels
 | caption2 = PS Tau boot on aftermarket frame & 110mm wheels
 | width1 = 174
 | width2 = 220
}}

A Trinity frame generally exhibits less wobble than 165mm and 195mm frames when comparing boots with similar sole rigidity and mounting platform strength. This is because a 165mm frame depends on the boot sole to function as a cantilever beam, with each side extending outward and applying bending forces to the centrally located mounting bolts. In contrast, a Trinity frame distributes structural support across the full width of the ball of the foot, much like a hockey blade holder with two front mounting wings. This broader support reinforces the sole and shortens its effective cantilever length on each side of the boot, resulting in better transfer of power from foot to wheels and support for weight transfer when leaning into an edge.<ref name="zecoprzepraszam-inerview-powerside-on-trinity-165mm-195mm"/><ref name="inlinex-trinity-mounting">{{cite web
|url=https://inlinex.com.sg/blogs/news/trinity-three-point-mount
|title=Trinity Three Point Mount
|first1=Adam
|last1=Choong
|date=2018-05-15
|website=Inlinex
|url-status=live
|archive-url=https://web.archive.org/web/20250303031629/https://inlinex.com.sg/blogs/news/trinity-three-point-mount
|archive-date=2025-03-03
|access-date=2025-03-03
}}</ref><ref name="powerslide-trinity-vs-195mm-2022">{{cite web
|url=https://www.youtube.com/watch?v=R0sDnLquuiY
|first1=Pascal
|last1=Briand
|title=Trinity vs 195 Mounting - PS live stream
|date=2022-03-22
|others=Pascal talks about Trinity's development history and specifications. He compares Trinity mounting to 195mm mounting, including the wide front mounts for better control and pushes.
|website=youtube.com
|publisher=Powerslide
|language=en
|format=video
|url-status=live
|archive-url=https://web.archive.org/web/20240323154657/https://www.youtube.com/watch?v=R0sDnLquuiY
|archive-date=2024-03-23
|access-date=2025-05-04
}}</ref><ref name="powerslide-launching-trinity-boots-and-frames-2016"/>

A Trinity frame typically has a lower "front" mount height than its 165mm counterpart when using the same wheel setup. This is because the front mount of a Trinity frame can be positioned significantly lower than the tops of the front wheels due to its open centerline. However, a reduction in mount height alone is not a meaningful metric for skaters. The true advantage of a Trinity frame lies in its ability to position the front of the boot as close to the ground as the front wheels allow, effectively lowering the skate’s center of gravity. This improves control and stability, resulting in a safer and more responsive skating experience.<ref name="zecoprzepraszam-inerview-powerside-on-trinity-165mm-195mm"/><ref name="ricardo-lino-on-trinity-2017">{{cite web
|url=https://www.youtube.com/watch?v=K5lwwHnCLSA
|first1=Ricardo
|last1=Lino
|title=Why Trinity? The latest generation inline skates frame system // vlog 182
|date=2017-11-07
|others=See video transcript
|website=youtube.com
|language=en
|format=video
}}</ref><ref name="powerslide-launching-trinity-boots-and-frames-2016"/>