MS vs MA Chassis: Which Should You Choose for Your Second Car?
Choose stock MS if your second car is meant to teach modular assembly and replacement of separate chassis units. Choose MA if you want another PRO drivetrain with a single-piece main frame and a clear maintenance routine. Buying MS does not mean buying a finished suspension or flex car. Start by deciding whether the second car is a dependable practice partner, a comparison platform or a separate modification project.
Decide what the second car must add
If your first car already runs reliably, a second car can preserve that reference while you learn. Keep one complete setup unchanged and use the other for adjustments. If the first car has unresolved rubbing or unreliable finishes, buying a different chassis can simply create a second troubleshooting project. Repair the known issue before assuming the new platform fixes it.
For a concrete purchase comparison, consider MS Tridagger XX 18629 and MA Blast Arrow 18635. They illustrate the frame difference, but the body and wheel arrangements also matter. Check each listing rather than treating every car in a chassis family as the same package.
Modular MS and monocoque MA
MS divides the chassis into nose, centre and tail units. MA uses a monocoque main frame. The practical MS appeal is being able to work with separate units; the practical MA appeal is keeping the main structure in one piece. Both still need correctly seated covers, bearings and gears. An extra joint is neither an automatic problem nor a promise of better handling.
A stock MS frame is not an MS flex conversion. Flex builds alter how parts move and can involve extensive cutting, hardware choices and class restrictions. Do not include an internet flex build's handling claims in a comparison of untouched kits. Price a conversion as its own project only after checking its instructions and the intended event rules.
Share tools, then verify each drivetrain part
Both platforms belong to the double-shaft PRO motor family, which is useful if you already own suitable PRO motors and maintenance tools. A matching motor family does not make every gear, cover or chassis part interchangeable. Check the exact gear ratio and part number in the kit manual, and keep the original components labelled.
Do the same for wheels, shafts, rollers and stays. A part that mounts to a chassis may still interfere with its body or change the finished dimensions. Make two lists: components you can already confirm fit, and components requiring a new purchase. That is a more useful cost comparison than the price of two boxes alone.
Keep a reference car and measure changes
Build the second car according to its instructions before experimenting. Check free wheel movement, wheel seating and body clearance, then run a modest baseline setup. Record the motor, tyres, ratio, battery preparation and course. Keep completed attempts as well as failures in your log; the quickest isolated lap says little about practice reliability.
If you compare the cars, label the results as complete-build comparisons unless the other variables really match. A different body, tyre diameter or battery pair can change the outcome. This guide reports construction and buying considerations, not measured MS-versus-MA lap performance. Keep a conversion budget separate from the money needed to get the stock car running.
What each second car adds
| Question | Stock MS | MA |
|---|---|---|
| Main construction | Nose, centre and tail units | Single-piece monocoque main frame |
| Motor family | Double-shaft PRO | Double-shaft PRO |
| Learning goal | Maintain a modular chassis | Repeat a monocoque maintenance routine |
| Suspension included? | Do not assume a flex conversion | Do not assume moving suspension |
| Parts transfer | Check each exact component | Check each exact component |
Product checklist
Use the exact kit pages below as the starting basket. Add only confirmed missing tools, batteries and replacement parts. Leave advanced conversion hardware out of the first order unless you already have a specific compatible plan. Availability and package contents should be checked on the listing before purchase.
Frequently asked questions
Does an MS kit include an MS flex setup?
No. A stock modular MS chassis and a modified flex build are different configurations.
Can MS and MA share motors?
Both use the double-shaft PRO family. Confirm the exact motor and the rules for your class.
Which is faster as a second car?
There is no universal answer. This guide contains no controlled MS-versus-MA lap test.
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Sources and specification checks
Checked 19 October 2026. Manufacturer sources establish construction and kit identity. Recommendations describe ownership tradeoffs, not a measured speed ranking.