Ratio Calc! vs E

Ratio Calc is a quick and easy tool for radio control car racers to use trackside. Knowing your final drive ratio (FDR) is very useful for comparison with other racers to determine if your car is geared correctly. It lets you quickly select your car by filtering on manufacturer and model. Select your pinion and spur size and the FDR is displayed. Tyre diameter can also be entered to calculate your rollout. Ratio and roll out charts are also available which plot pinion and spur gear combinations to create very handy reference tables. - Save your favourite cars for quick access - Select measurement units (imperial/metric) - Select your preferred gear pitch, alternative ratios in other pitches will be shown - Over 2000 cars/variants in the database which is updated regularly

E-Grid is the companion app for motorsport fans who follow more than one series. Subscribe to the championships you love and get everything in one clean, fast app: schedules, countdowns, reminders, standings, results and news. CHANNELS, NOT CLUTTER Pick your series - Formula 1, MotoGP, the NASCAR Cup Series, IndyCar, Formula E, the World Rally Championship, the World Endurance Championship (including the 24 Hours of Le Mans), IMSA (including Petit Le Mans), NHRA Drag Racing, Formula 2, Formula 3, the Porsche Mobil 1 Supercup and the Clio Cup Series - thirteen channels at launch, with more on the way. From the biggest championships to the one-make cups the paddock loves, your home screen shows only what you follow, with the next race always front and centre. Where a series publishes full data, you get standings and results; where it doesn't, we say so and give you the calendar, countdowns, reminders and news - we would rather under-promise than pretend. NEVER MISS LIGHTS OUT A live countdown to the next race, every session time in your local time zone, and optional reminders one hour before the start plus a race-morning nudge. Set it once and forget the timetable. FULL SEASON CALENDAR Every round of every series you follow, grouped by month, in one combined calendar. See at a glance when the next race weekend is - and when two of your series clash. CHAMPIONSHIP STANDINGS Follow the title fight with F1 driver and constructor standings plus the full classification from the last Grand Prix, MotoGP rider standings, and Formula E driver standings - updated after every round. ALL YOUR NEWS IN ONE FEED Headlines from leading motorsport publications, merged into a single feed and filterable by series. Tap through to read the full story at the source. KNOW THE RULES Quick links to the FIA sporting regulations for each championship, so you can settle any argument about penalties, points or parc ferme. FULL GRID PREMIUM The free plan includes one channel with news, calendar and standings. Premium unlocks: - Unlimited channels - follow every series - Race reminders and race-day notifications - Full standings, results and stats Premium is $0.99/month with your first month free, or $9.99/year. DESIGNED FOR EVERY DEVICE Optimised for iPhone and iPad, with full dark mode - because most races are best watched with the lights down. Full Grid is an independent app built by motorsport fans at Opticell Limited. It is not affiliated with, endorsed by, or associated with Formula 1, the FIA, WRC Promoter GmbH, NASCAR, IndyCar, or any racing series or promoter. News content remains the property of its publishers. Subscriptions auto-renew until cancelled. Manage or cancel anytime in Settings → Apple ID → Subscriptions. Terms: standard Apple EULA (https://www.apple.com/legal/internet-services/itunes/dev/stdeula/). Privacy: https://www.opticell-limited.com/rally