Castelli vs Rapha:Which is more popular?
In September 2026, Rapha had more branded searches than Castelli among bike shorts brands worldwide. Rapha had about 135,000 branded searches, while Castelli had 110,000. Rapha made up 30% of all bike shorts brand searches we track, and Castelli accounted for 24.4%. When we asked ChatGPT and Google AI Overviews about bike shorts brands, Castelli and Rapha each appeared in four of the five answers. Castelli was mentioned before Rapha in two out of three answers that named either.
Who do people search for more?
Rapha, about 23% more searches than Castelli
Who does AI mention more?
Both were mentioned in 4 of 5 answers.
Who does AI recommend more?
Castelli, named ahead of Rapha in 2 of 3 answers
Follow Castelli vs Rapha and get free monthly updates on what changed
By continuing you'll get index updates and occasional product news from Brandwave. Unsubscribe any time. Privacy
Top bike shorts brands in ChatGPT and Google AI Overviews
In three ChatGPT questions and two Google AI Overviews, Castelli and Rapha were each mentioned in four out of five: in two of the three ChatGPT answers and in both Google AI Overviews. Castelli was listed before Rapha in two out of three answers that named either.
Most recommended by AI
Brands get a higher ranking if they are mentioned earlier in the answers.
Mentioned by AI
Each dot is one answer, filled in when that answer mentions the brand.
- Rapha4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
- Castelli4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Assos3 of 5Named in 1 of 3 ChatGPT answersNamed in 2 of 2 Google answers
Pearl Izumi3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
Baleaf2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
Lululemon2 of 5Named in 2 of 3 ChatGPT answersNamed in 0 of 2 Google answers
See every answer about bike shorts brands
5 answers
Asked ChatGPT
“Which bike shorts brand should I buy?”
Asked ChatGPT
“What are the best bike shorts brands?”
Asked ChatGPT
“What's the best bike shorts brand for long distance comfort?”
Searched Google, AI Overview
“best bike shorts”
Searched Google, AI Overview
“bike shorts for men”
Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.
Is Castelli or Rapha more popular in search?
This chart shows how often people search Google for Castelli and Rapha by name. Each line represents a brand's share of searches for all six bike shorts brands we track, month by month, from English-language searches worldwide.
Share of searches by month for Rapha, Castelli. The figures are in the table below the chart.
View monthly share of searches table
| Month | Assos | Rapha | Castelli | Pearl Izumi | Baleaf | Lululemon |
|---|---|---|---|---|---|---|
| Oct 2025 | 32.6% | 32.6% | 26.7% | 5.4% | 2% | 0.71% |
| Nov 2025 | 34.3% | 34.3% | 23% | 5.7% | 2.1% | 0.61% |
| Dec 2025 | 34.2% | 34.2% | 22.8% | 5.6% | 2.5% | 0.6% |
| Jan 2026 | 32.5% | 32.5% | 26.6% | 5.3% | 2.4% | 0.71% |
| Feb 2026 | 30.3% | 30.3% | 30.3% | 6.1% | 2.2% | 0.65% |
| Mar 2026 | 36.6% | 30% | 24.6% | 6% | 2.2% | 0.65% |
| Apr 2026 | 34.7% | 28.5% | 28.5% | 5.7% | 2.1% | 0.62% |
| May 2026 | 32.2% | 32.2% | 26.4% | 6.5% | 1.9% | 0.71% |
| Jun 2026 | 36.5% | 30% | 24.5% | 6% | 2.2% | 0.8% |
| Jul 2026 | 38.9% | 31.8% | 21.4% | 5.2% | 1.9% | 0.7% |
| Aug 2026 | 37.2% | 30.4% | 24.9% | 5% | 1.8% | 0.67% |
| Sep 2026 | 36.6% | 30% | 24.4% | 6% | 2.2% | 0.8% |
How has the Castelli and Rapha comparison changed over the last 12 months?
3 findings
- Rapha was ahead of Castelli in every measured month of the 12 months ending September 2026.
- Across the 12 months ending September 2026, Castelli’s share of searches among bike shorts brands worldwide moved from 26.7% to 24.4%, and its estimated monthly branded searches moved from 135K to 110K.
- Across the 12 months ending September 2026, Rapha’s share of searches among bike shorts brands worldwide moved from 32.6% to 30%, and its estimated monthly branded searches moved from 165K to 135K.
How did search popularity change for bike shorts brands worldwide in September 2026?
2 changes
In September 2026, Castelli lost share of searches among bike shorts brands worldwide, from 24.9% to 24.4%.
Estimated monthly branded searches for Rapha worldwide fell 18.2% over 12 measured months, from 165K to 135K in September 2026.
How are branded searches counted?
2 search terms
Brandwave collects information about searches that people make online using Castelli’s and Rapha’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.
Other head-to-heads among bike shorts brands
Put your own brand in this comparison
Brandwave tracks your branded demand next to the rival you actually watch, with your campaigns, spend and outcomes on the same timeline.