Mini Bike Wheels, unlike those on larger dirt bikes, often lack an internal spacer within the wheel hub between the bearings. This difference raises a crucial question for mini bike enthusiasts: is an internal spacer necessary, and what are the implications of its absence? This article delves into the discussion surrounding internal spacers in mini bike wheels, drawing upon insights from experienced riders and mechanics.
The debate originates from the design variations between mini bikes and dirt bikes. Dirt bikes typically incorporate an internal spacer, allowing riders to firmly tighten the axle nut, creating a robust wheel assembly. This spacer prevents over-tightening from directly impacting the bearings. In contrast, many mini bike wheels are designed without this internal spacer. This means that over-tightening the axle nut on a mini bike wheel can directly compress the bearings, potentially leading to premature wear or damage.
However, experienced mini bike mechanics argue that internal spacers are not always essential for these smaller machines, especially for recreational use. They emphasize that many mini bikes were originally designed as toys for children and were built with simplicity in mind. Flangeless bearings were sometimes used, and the absence of an internal spacer was part of the original design philosophy. The key, they suggest, is to avoid over-tightening the axle nut. With careful adjustment, the lock nut can be secured without preloading the bearings to a damaging extent.
Despite the arguments against their necessity, some mini bike enthusiasts advocate for the inclusion of internal spacers as an upgrade. They believe that adding a spacer can extend the lifespan of wheel bearings and enhance the overall durability of the mini bike wheels. For those inclined to add a spacer, readily available spacer material, such as 5/8″ ID steel axle bushing, can be cut to the appropriate length. Creating a spacer involves measuring the distance between the inner edges of the bearings and cutting the spacer accordingly. To keep the spacer in place during wheel changes, some suggest welding or attaching larger diameter washers to each end.
Alternative solutions and upgrades are also discussed within the mini bike community. Some recommend using flanged bearings as an improvement over standard bearings. Others suggest using locking nuts to maintain axle tension without fully tightening, which can be particularly useful when operating without internal spacers. For those looking for readily available parts, retailers like OldMiniBikes Warehouse offer spacer material and other components.
In conclusion, the necessity of internal spacers in mini bike wheels remains a point of discussion. While not strictly required for all mini bike applications, particularly lighter-duty use, adding an internal spacer can be a worthwhile upgrade for riders seeking increased bearing longevity and wheel assembly robustness. Ultimately, the decision to incorporate an internal spacer depends on individual preferences, riding style, and desired level of wheel durability. Whether you choose to keep the original design or implement modifications, understanding the mechanics of mini bike wheels and proper axle tightening is crucial for maintenance and performance.
