Zamp RZ-42Y Rear Spoiler
Zamp RZ-42Y Rear Spoiler
In stock
Couldn't load pickup availability
Zamp RZ-42Y Rear Spoiler. Aero for the youth lid.
A rear spoiler from Zamp, listed on Zamp's parts sheet for the RZ-42Y.
WHAT'S IN THE BOX
- One Zamp rear spoiler
- Zamp part number HSZ221CL
CERT
None. Helmet aero accessory.
HEADS UP ON FIT
Zamp's parts sheet lists this for the RZ-42Y. That is the only fitment we can confirm. Running something else? Message us if unsure.
FastLap Supply Take: If your lid is on the list, bolt it on. If it is not, do not try to make it fit.
FAQ
Will it fit my helmet?
Only the helmet Zamp lists: the RZ-42Y. For anything else, ask us before you order.
Does it come with mounting hardware?
Zamp does not say on its parts sheet. Ask us and we will confirm before you order.
Share

Helmet Size Charts
Head measurements vary by brand. Measure the widest part of your head above the ears.
| Size | Inches | CM | Hat Size |
|---|---|---|---|
| XS | 20-7/8 - 21-1/4 | 53-54 | 6-5/8, 6-3/4 |
| S | 21-5/8 - 22 | 55-56 | 6-7/8, 7 |
| M | 22-3/8 - 22-3/4 | 57-58 | 7-1/8, 7-1/4 |
| L | 23-1/4 - 23-5/8 | 59-60 | 7-3/8, 7-1/2 |
| XL* | 24 - 24-3/8 | 61-62 | 7-5/8, 7-3/4 |
| Size | Inches | CM | Hat Size |
|---|---|---|---|
| XXS | 21-1/2 - 21-5/8 | 54-55 | 6-3/4, 6-7/8 |
| XS | 22 | 56 | 7 |
| S | 22-3/8 | 57 | 7-1/8 |
| M | 22-3/4 - 23-1/4 | 58-59 | 7-1/4, 7-3/8 |
| L | 23-5/8 | 60 | 7-1/2 |
| XL | 24 - 24-3/8 | 61-62 | 7-5/8, 7-3/4 |
| XXL | 24-3/4 - 25-1/4 | 63-64 | 7-7/8, 8 |
| 3XL | 25-5/8 - 26 | 65-66 | 8-1/8, 8-1/4 |
| 4XL | 26-3/8 - 26-3/4 | 67-68 | 8-3/8, 8-1/2 |
| Size | Inches | CM | Hat Size |
|---|---|---|---|
| XXS | 21-1/2 - 21-5/8 | 54-55 | 6-3/4, 6-7/8 |
| XS | 22 | 56 | 7 |
| S | 22-3/8 | 57 | 7-1/8 |
| M | 22-3/4 - 23-1/4 | 58-59 | 7-1/4, 7-3/8 |
| L | 23-5/8 | 60 | 7-1/2 |
| XL | 24 - 24-3/8 | 61-62 | 7-5/8, 7-3/4 |
| XXL | 24-3/4 - 25-1/4 | 63-64 | 7-7/8, 8 |
| Size | Inches | CM | Hat Size |
|---|---|---|---|
| XS | 20-7/8 - 21-1/4 | 53-54 | 6-5/8, 6-3/4 |
| S | 21-5/8 - 22 | 55-56 | 6-7/8, 7 |
| M | 22-3/8 - 22-3/4 | 57-58 | 7-1/8, 7-1/4 |
| L | 23-1/8 - 23-1/2 | 59-60 | 7-3/8, 7-1/2 |
| XL | 23-7/8 - 24-1/4 | 61-62 | 7-5/8, 7-3/4 |
| XXL | 24-3/4 - 25-1/8 | 63-64 | 7-7/8, 8 |
| Size | Inches | CM | Hat Size |
|---|---|---|---|
| XS | 21-1/4 - 21-5/8 | 54-55 | 6-3/4, 6-7/8 |
| S | 22 - 22-1/2 | 56-57 | 7, 7-1/8 |
| M | 22-7/8 - 23-1/4 | 58-59 | 7-1/4, 7-3/8 |
| L | 23-5/8 - 24 | 60-61 | 7-1/2, 7-5/8 |
| XL | 24-3/8 - 24-3/4 | 62-63 | 7-3/4, 7-7/8 |
| XXL | 25-1/4 - 25-5/8 | 64-65 | 8, 8-1/8 |
| Size | Inches | CM | Hat Size |
|---|---|---|---|
| XXS | 21-1/2 - 21-5/8 | 54-55 | 6-3/4, 6-7/8 |
| XS | 22 | 56 | 7 |
| S | 22-3/8 | 57 | 7-1/8 |
| M | 22-3/4 - 23-1/4 | 58-59 | 7-1/4, 7-3/8 |
| L | 23-5/8 | 60 | 7-1/2 |
| XL | 24 - 24-3/8 | 61-62 | 7-5/8, 7-3/4 |
| XXL | 24-3/4 - 25-1/4 | 63-64 | 7-7/8, 8 |
| Size | Inches | CM | Hat Size |
|---|---|---|---|
| XXS | 20 - 20-1/2 | 51-52 | 6-3/8, 6-1/2 |
| XS | 20-7/8 - 21-1/4 | 53-54 | 6-5/8, 6-3/4 |
| S | 21-5/8 - 22-1/16 | 55-56 | 6-7/8, 7 |
| M | 22-7/16 - 22-7/8 | 57-58 | 7-1/8, 7-1/4 |
| L | 23-1/4 - 23-5/8 | 59-60 | 7-3/8, 7-1/2 |
| XL | 24 - 24-3/8 | 61-62 | 7-5/8, 7-3/4 |
| XXL | 24-13/16 - 25-3/16 | 63-64 | 7-7/8, 8 |
| 3XL | 25-1/2+ | 65+ | 8-1/8 |
| Size | CM | Hat Size |
|---|---|---|
| XS | 54 | 6-3/4 |
| S | 56 | 7 |
| M | 59 | 7-3/8 |
| L | 60 | 7-1/2 |
| XL | 61 | 7-5/8 |
| XXL | 63 | 8 |
| Size | Inches | CM | Hat Size |
|---|---|---|---|
| XS | 21.25 | 54 | 6-3/4 |
| S | 21.65 | 55 | 6-7/8 |
| M | 22.45 | 57 | 7-1/8 |
| L | 22.8 - 23.25 | 58-59 | 7-1/4, 7-3/8 |
| L+ | 23.6 - 24 | 60-61 | 7-1/2, 7-5/8 |
| XL | 24.4 | 62 | 7-3/4 |
| XXL | 24.8 | 63 | 7-7/8 |
| Size | Inches | CM | Hat Size |
|---|---|---|---|
| XS | 20-3/4 - 21-1/4 | 53-54 | 6-5/8, 6-3/4 |
| S | 21-1/2 - 21-7/8 | 55-56 | 6-7/8, 7 |
| M | 22-1/4 - 22-5/8 | 57-58 | 7-1/8, 7-1/4 |
| M/L* | 23 - 23-1/2 | 59-60 | 7-3/8, 7-1/2 |
| L | 23 - 23-1/2 | 59-60 | 7-3/8, 7-1/2 |
| XL | 23-7/8 - 24-1/4 | 61-62 | 7-5/8, 7-3/4 |
Actually Measuring Your Head
Use a soft measuring tape (craft store, like $3). Wrap it around the widest part of your dome, forehead to back, and get the same number twice. Use that number to pick your size. Revolutionary, we know. lol.