Attaching baseball cards to your bike spokes can be a fun way to customize your bike and add some creative flair as you ride. It’s important to do it safely in a way that will not compromise riding control or damage your bicycle. Here are the step-by-step instructions:

First, you’ll need to gather your supplies which include a pack of baseball cards, zip ties in varying lengths, scissors, and optionally a tape measure. Make sure to select cards you don’t mind getting scraped or damaged during the process and while riding. Inspect your bike wheels and inspect the spacing between each individual spoke – you’ll want to attach a card about every 1-2 inches to properly space them out without crowding.

Next, measure and cut zip ties to lengths roughly 1-2 inches longer than the spacing between spokes. You’ll need multiple ties per card to securely attach them. Start by feeding one end of a zip tie through the spoke from the outside of the wheel moving inward, leaving the clasp end accessible outside of the wheel. Don’t fully tighten it yet.

Select your first baseball card and center it vertically on the spoke you just fed the zip tie through. Make sure it’s laying flat against the spoke and not at an angle where it could catch the wind oddly. From the front of the card, feed the zip tie end back through one of the small holes punched in the card.

Tighten the zip tie snugly so the card is held firmly against the spoke without damaging or kinking the spoke wire. Check that it still spins freely. Add a second zip tie through another hole in the card for added security and wind it taut. Trim off any excess length from the zip ties with scissors so there are no sharp ends dangling.

Continue attaching additional cards spaced evenly around the wheel, using multiple zip ties per card as needed. Leave a small gap between cards so they don’t rub against each other during use. Once the first wheel is complete, repeat the process on your other wheel to maintain symmetry if desired.

Take your time and be very careful when tightening zip ties around the spokes so as not to damage them. Inspect your work thoroughly before riding to ensure nothing is too loose or at risk of coming off. Go for a test ride at low speeds and watch how the cards behave in motion without causing any handling issues.

With this careful installation process, your baseball card-adorned bike wheels can last for many joyful rides through your neighborhood or trails. Just be sure to check them occasionally for any signs of damage or detachment, tightening or replacing securements as needed to keep them safely attached. Have fun showing off your customized cruiser to others while pedaling around!

Let me know if any part of the process needs more explanation or clarification to attach the baseball cards securely yet gently to your bicycle spokes. The key things to remember are using multiple ties per card, leaving spoke movement unrestricted, and monitoring their condition over time for continued safe riding enjoyment. With the right materials and careful technique, it’s a fun craft that can personalized your bike without compromising its operation.