{"merchant":{"slug":"bowlersmart","name":"BowlersMart","domain":"www.bowlersmart.com"},"id":"1162284","sku":"BBMRGX","gtin":null,"name":"Roto Grip Gremlin Bowling Ball","brand":"Roto Grip","categories":[{"name":"Asymmetrical Core Bowling Balls","slug":"asymmetrical-core-bowling-balls"},{"name":"Bowling Balls","slug":"bowling-balls"},{"name":"Heavy Oil Bowling Balls","slug":"heavy-oil-bowling-balls"},{"name":"High Performance Bowling Balls","slug":"high-performance-bowling-balls"},{"name":"MRP/MAP","slug":"mrp-map"},{"name":"Pearl Reactive Bowling Balls","slug":"pearl-reactive-bowling-balls"},{"name":"Pre-Orders / New Releases","slug":"new-bowling-balls"},{"name":"Roto Grip","slug":"roto-grip"},{"name":"Roto Grip Bowling Balls","slug":"roto-grip-bowling-balls"}],"buy_url":"https://www.bowlersmart.com/product/roto-grip-gremlin-bowling-ball/","pages":{"html":"https://ittems.com/bowlersmart/p/roto-grip-gremlin-bowling-ball","md":"https://ittems.com/bowlersmart/p/roto-grip-gremlin-bowling-ball.md","json":"https://ittems.com/bowlersmart/p/roto-grip-gremlin-bowling-ball.json"},"price":{"min":154.95,"max":154.95,"currency":"USD"},"availability":"instock","checked_at":"2026-10-15T22:14:34.802393+00:00","source_updated_at":"2026-10-15T21:33:20+00:00","summary":"What should I know about the Gremlin? Maxed-out asymmetric Rondure core for length and a strong, continuous backend Nano-free V-R1 Pearl Reactive cover, polished at Power Edge Built for medium to medium-heavy oil with length and recovery","specs":[{"key":"Brand","value":"Roto Grip"},{"key":"Bowling Ball Core Shape","value":"Asymmetrical Core"},{"key":"Bowling Ball Core Name","value":"Roto Grip Rondure Core"},{"key":"Bowling Ball Cover Name","value":"Roto Grip V-R1 Pearl Reactive"},{"key":"Bowling Ball Coverstock Type","value":"Pearl Reactive"},{"key":"Radius of Gyration: RG (15LB)","value":"2.50"},{"key":"Differential: Diff (15LB)","value":".058"},{"key":"Mass Bias Strength","value":".010"},{"key":"Flare Potential","value":"5 - 6 Inches"},{"key":"Surface Finish","value":"Storm Power Edge"},{"key":"Ball Performance Level","value":"High Performance Bowling Balls, Roto Grip HP3 Bowling Balls"},{"key":"Preferred Lane Conditions","value":"Medium - Heavy Oil"},{"key":"Bowling Ball Color","value":"Blue, Purple, Red"},{"key":"Scent","value":"None"},{"key":"Release Date","value":"July 2025"}],"variants":[{"sku":"RGBBMRGX16","gtin":"887970727546","label":"16LB","price":154.95,"stock":13,"options":{"Ball Weight":"16LB"},"availability":"instock","regular_price":249.95},{"sku":"RGBBMRGX15","gtin":"887970727522","label":"15LB","price":154.95,"stock":127,"options":{"Ball Weight":"15LB"},"availability":"instock","regular_price":249.95},{"sku":"RGBBMRGX14","gtin":"887970727492","label":"14LB","price":154.95,"stock":28,"options":{"Ball Weight":"14LB"},"availability":"instock","regular_price":249.95},{"sku":"RGBBMRGX13","gtin":"887970727461","label":"13LB","price":154.95,"stock":9,"options":{"Ball Weight":"13LB"},"availability":"instock","regular_price":249.95},{"sku":"RGBBMRGX12","gtin":"887970727430","label":"12LB","price":154.95,"stock":14,"options":{"Ball Weight":"12LB"},"availability":"instock","regular_price":249.95}],"images":[{"alt":"GREMLIN_No-Shadow","url":"https://www.bowlersmart.com/wp-content/uploads/2025/06/GREMLIN_No-Shadow.webp"},{"alt":"roto-grip-rondure-core","url":"https://www.bowlersmart.com/wp-content/uploads/2022/06/roto-grip-rondure-core.png"}],"release_date":"July 2025","description":"A Maxed-Out Pearl Built for Length and a Continuous Backend\n\nAbout the Gremlin\n\nThe Roto Grip Gremlin is the pearl that started the Gremlin Series. It pairs a maxed-out version of Roto Grip's asymmetric Rondure core with the nano-free V-R1 Pearl Reactive coverstock to deliver clean length through the front of the lane and a strong, continuous response off the dry. It is built for bowlers who want a pearl that reads later and keeps driving rather than jumping.\n\nRoto Grip's R&D lab pushed the Rondure core to its limits for the Gremlin, raising both the RG and the differential to the highest values that shape has ever carried. The result is the longest, most continuous motion in the family: a pearl that lets you move deeper on the lane and still comes around the corner, complementing your stronger asymmetric solids when the heads start to open. Finished at Power Edge polish in a Plum, Raisin, and Tanzanite cosmetic, it handles medium to medium-heavy oil with length and forgiveness.\n\nUnderstanding the Roto Grip Rondure MaxD Core and Roto Grip V-R1 Pearl Reactive\n\nRoto Grip built the Gremlin around length and continuation. Specifically, the maxed-out Rondure MaxD core carries the highest RG and differential the shape has ever had, so the ball revs up later and stores energy deep into the pattern for a strong, continuous finish. The nano-free V-R1 Pearl Reactive cover, polished at Power Edge, pushes easily through the front of the lane, then responds to friction down-lane without getting out of control. The full per-weight specifications are listed below.\n\nA Maxed-Out Asymmetric Core for the Longest, Most Continuous Motion in the Gremlin Family\n\nAt the heart of the Gremlin is the asymmetric Rondure MaxD core, a maxed-out version of Roto Grip's proven Rondure shape. At 15 lb it measures RG 2.50, a strong .058 differential, and a .010 intermediate differential (mass bias). Roto Grip's R&D lab changed the densities of both the block and the bottom slug to push the RG and the differential to the highest values this core has ever carried, which is what gives the Gremlin its length and its big, continuous backend.\n\nThat maxed-out shape is the whole story. A higher RG means the ball revs up later and saves its energy for the back of the lane, while the strong differential delivers the flare to clear the oil. Together they produce a pearl that pushes long through the fronts and then makes a strong, continuous move: more room for error than a sharp, jumpy reaction, and exactly the shape you want when you need length with recovery.\n\nA Nano-Free Pearl That Pushes Easily and Responds Without Getting Out of Control\n\nThe Gremlin wraps that core in the V-R1 Pearl Reactive coverstock, finished at Power Edge polish. The V-R1 (Versatile Response) shell is a nano-free formulation built to handle a wide range of oil conditions and types, from the fresh to the transition to the burn. It pushes easily through the front of the lane, then responds consistently to friction down-lane without overreacting, which is what makes the Gremlin so playable as the lanes change.\n\nPaired with the maxed-out Rondure core, the V-R1 Pearl gives the Gremlin a clean length-and-continuation shape. It is the pearl that complements your stronger asymmetric solids: when the heads open up and you want to move deeper, the Gremlin lets you get to the friction and still comes around the corner. Leave it polished for the most length, or take the surface down at your pro shop for an earlier read when the oil increases.\n\nGremlin Specs\n\nRG and differential vary by weight. Specifications provided by the manufacturer.\n\nWho This Ball Is Right For\n\n✓Tournament Players: A clean, continuous pearl that lets you move deeper as the lanes transition and still recovers off the dry\n\n✓Higher-Rev Bowlers: The maxed-out Rondure core stores energy for revs, delivering length with a strong, continuous backend instead of a sharp flip\n\n✓Arsenal Builders: The pearl that complements your strong asymmetric solids, the step-down ball once the heads start to open\n\n✓Length Seekers: Polished V-R1 Pearl pushes easily through the fronts for bowlers who need the ball to get down the lane\n\nGood to Know Before You Buy\n\n·Strong, aggressive motion: This is a high-flare piece built for traction. If you want a controlled, lower-hook reaction, a lower-differential ball will suit you better.\n\n·Ships polished: The Power Edge (Polished) finish runs clean and long out of the box. For an earlier read on heavier oil, take the surface down at your pro shop.\n\n·Asymmetric layout sensitivity: Layout choices shift the reaction more than on a symmetric ball. Match the pin and mass bias to your game with your pro shop.\n\n·Colors vary: Actual colors vary somewhat from the photos shown; no two balls come out of the mold exactly alike.\n\n·Tiny pit holes are normal: A few tiny pit holes in the coverstock are a normal part of the manufacturing process.\n\n·Sold undrilled: Ships without finger holes, so it can be fitted to your hand and span.\n\nBowlersMart Tips: Where the Gremlin Fits in Your Roto Grip Arsenal\n\nWhere It Fits in Your Arsenal\n\nIn the Roto Grip lineup, the Gremlin is your length-and-continuation pearl. Where strong solids attack the freshest, heaviest oil, the Gremlin steps in once the heads open slightly: it pushes through the front of the lane, lets you move deeper, and still comes around the corner with a continuous, forgiving motion. It pairs naturally above your strongest solids and below cleaner, weaker pearls, the ball you reach for when you need length without giving up backend.\n\nSurface Adjustments\n\nThe Power Edge polish is a length-and-continuation setup out of the box. Take the surface down with a lower-grit pad for an earlier, stronger read when the oil increases, or re-polish to restore length. Have surface changes done at your pro shop for an even, consistent finish.\n\nCoverstock Care\n\nWipe the V-R1 Pearl cover with an approved reactive ball cleaner after every session, and deep clean it periodically. Keeping the cover fresh preserves the easy length and continuous friction response that make the Gremlin so playable.\n\nEarn points on every Roto Grip purchase through the Striking Rewards loyalty program. Every ball you add to your arsenal builds toward your next reward.\n\nShop With Confidence at BowlersMart\n\nThe Roto Grip Gremlin Bowling Ball ships free with no minimum purchase and is backed by our 60-day return policy. As an authorized Roto Grip dealer, every ball is genuine and covered by the full one-year Roto Grip warranty. Place your order before 2 PM EST and it ships the same day.\n\nWeight\nRadius of Gyration (RG)\nDifferential\nMass Bias\n\n16 lbs\n2.50\n.056\n.008\n\n15 lbs\n2.50\n.058\n.010\n\n14 lbs\n2.54\n.058\n.008\n\n13 lbs\n2.57\n.032\n.010\n\n12 lbs\n2.59\n.029\n.011","policies":[{"text":"Free ground shipping on US orders, no minimum, 48 contiguous states and military APO/FPO. To Alaska, Hawaii, Puerto Rico and Guam bowling balls ship for $24.95 per ball, most other items free; oversized roller bags cost extra there. International orders pay the rate shown at checkout, duties paid locally.","title":"Shipping","source_url":"https://www.bowlersmart.com/shipping-information/"},{"text":"In-stock items ordered by 2PM EST Monday to Friday ship the same day, later orders the next business day. Carriers USPS, UPS, FedEx. Standard delivery 3 to 7 business days; expedited options at checkout.","title":"Processing and delivery","source_url":"https://www.bowlersmart.com/shipping-information/"},{"text":"60 days from delivery for US customers on new, unused items in original packaging, free prepaid return labels. Drilled bowling balls cannot be returned or exchanged. Shoes must have been tried on a clean, dry surface. Manufacturing defects and shipping damage go through the defect claim process.","title":"Returns","source_url":"https://www.bowlersmart.com/return-exchange-policy/"},{"text":"Credit and debit cards, PayPal, Apple Pay, Google Pay, Venmo, Amazon Pay, and buy now pay later through Affirm, Afterpay and Klarna.","title":"Payment","source_url":"https://www.bowlersmart.com/payment-options/"},{"text":"Pro shops inside bowling centers in 10 US states fit, drill and service equipment; a ball bought online can be drilled there.","title":"Pro shops","source_url":"https://www.bowlersmart.com/locations/"},{"text":"www.bowlersmart.com is the only website of BowlersMart. Lookalike domains are fraudulent.","title":"Identity","source_url":"https://www.bowlersmart.com/resources/scam-awareness/"}]}