# HollowGrind: Skate ROH Calc — Radius of hollow, FBV & bite

> Radius of hollow, FBV & bite (iPhone/iPad app by Yoshifumi Sato.)

- Source: https://appshunter.io/ios/app/hollowgrind-skate-roh-calc/id6795146746 (this page in markdown: same URL + `.md`)
- Developer: [Yoshifumi Sato](https://appshunter.io/developer/6780413827)
- Category: Sports
- Price: $3.99
- Age rating: 4+
- Requires: iOS 17.0 · 11 MB
- Languages: American English, Japanese
- Released: 2026-08-05
- Data updated: 2026-08-23
- User reviews in markdown: https://appshunter.io/ios/app/hollowgrind-skate-roh-calc/id6795146746/reviews.md

## What is HollowGrind?

HollowGrind turns a radius of hollow (ROH) into the numbers that actually describe your skate edge: hollow depth and bite angle.

Pick an ROH in inches or millimeters and your blade width — HollowGrind shows the hollow depth and the bite angle at the edge, with a cross-section view. Compare common ROH values side by side, or work in Flat Bottom V (FBV) mode.

FEATURES
• Hollow depth (sagitta) and bite angle from ROH and blade width
• Inch-fraction ROH presets (3/8" to 1-1/2") and millimeters
• Blade cross-section diagram
• FBV (Flat Bottom V) mode
• Side-by-side ROH comparison table
• Save your blade profiles

100% offline. No ads. No tracking. No account. A one-time purchase.


## Version history (last 1 release)

### 1.0 — 2026-08-06

No release notes.

## More apps by Yoshifumi Sato

- [おけいこ月謝帳 教室の集金管理](https://appshunter.io/ios/app/id6787108752)
- [DualShot: Front & Back Cam](https://appshunter.io/ios/app/dualshot-front-and-back-cam/id6788761561)
- [Progressly – Body Progress](https://appshunter.io/ios/app/progressly-body-progress/id6789591055)
- [Holdly – Isometric Timer](https://appshunter.io/ios/app/holdly-isometric-timer/id6789790139)
- [かんじ1年生 小学1年の漢字ドリル](https://appshunter.io/ios/app/1-1/id6789917332)
- [かんじ3年生 小学3年の漢字ドリル](https://appshunter.io/ios/app/3-3/id6790055787)

All apps by Yoshifumi Sato: https://appshunter.io/developer/6780413827

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*